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Best Liquid Aquarium Kits of 2026
Last updated on 04/04/2026
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1
AquaCare 6 in 1 Aquarium Master Test Kit for Freshwater Aquariums includes tests for Ammonia, Nitrite, Nitrate, pH, Phosphate and KH
AquaCare
Why we love it
Ensures healthy aquarium environment.
Long-lasting with 200 tests.
Highly accurate and reliable.
Main Highlights
The AquaCare Master Test Kit for freshwater aquariums contains: 6 tests Ammonia, Nitrite, Nitrite, pH, Phosphate, KH. It also has 6 test tubes, a syringe for easy measuring and instruction manual.
Helps you to understand your water levels so you can control quality to avoid invisible water damage. Unstable water parameters can be harmful to the fish and can lead to sick fish.
For freshwater aquariums only. This item is double sided, and the tests are safe and will work in outdoor garden ponds. This item is not for use in marine aquariums. This works as a pond test kit.
The master test kit includes over 200 test attempts. We advise testing weekly therefore this one kit will last you over 6 months. Test kits is a must have for all fishkeepers.
The AquaCare Master test kit is highly accurate, easy to use and reliable. Whilst strip tests or dip tests are often cheaper, they don’t tend to be as accurate and liquid tests. For best results and a safe aquarium we recommend liquid test kits.
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9.9
Exceptional
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9.9
Exceptional
AquaCare
AquaCare 6 in 1 Aquarium Master Test Kit for Freshwater Aquariums includes tests for Ammonia, Nitrite, Nitrate, pH, Phosphate and KH
Check Price
Show More
Why we love it
Ensures healthy aquarium environment.
Long-lasting with 200 tests.
Highly accurate and reliable.
Main Highlights
The AquaCare Master Test Kit for freshwater aquariums contains: 6 tests Ammonia, Nitrite, Nitrite, pH, Phosphate, KH. It also has 6 test tubes, a syringe for easy measuring and instruction manual.
Helps you to understand your water levels so you can control quality to avoid invisible water damage. Unstable water parameters can be harmful to the fish and can lead to sick fish.
For freshwater aquariums only. This item is double sided, and the tests are safe and will work in outdoor garden ponds. This item is not for use in marine aquariums. This works as a pond test kit.
The master test kit includes over 200 test attempts. We advise testing weekly therefore this one kit will last you over 6 months. Test kits is a must have for all fishkeepers.
The AquaCare Master test kit is highly accurate, easy to use and reliable. Whilst strip tests or dip tests are often cheaper, they don’t tend to be as accurate and liquid tests. For best results and a safe aquarium we recommend liquid test kits.
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Value for Money
2
NT Labs Marine Lab Multi-Test Kit (4 Key Parameters - Ammonia, Nitrite, Nitrate & pH), Marine Water Test Kit, Accurate Results, Liquid Drop Tests (Up to 155 Tests)
NT Labs
Why we love it
Effortlessly assess key parameters.
Accurate and dependable results.
Easy and convenient use.
Main Highlights
【 4 IN 1 TEST KIT 】: Our multi-test kit enables marine aquarium owners to effortlessly assess 4 key water parameters using a single test kit. These tests include Ammonia, Nitrite, Nitrate and pH.
【 ACCURATE LIQUID DROP TESTS 】: All the tests are liquid drop tests from a dropper bottle to ensure the drops are the same size. This method of testing is significantly more precise compared to using dip strips. The use of liquid reagents guarantees accurate and dependable results for each parameter, simplifying the process of monitoring and maintaining ideal water conditions in your marine aquarium.
【 SUCCESSFUL FISH KEEPING 】This test kit reports concentration in terms of nitrogen (NH3-N), (NO2-N) or (NO3-N) to be compatible with reported safe concentrations as they apply to fish and plants. The Multi-Test is designed to be used alongside the Marine Reef Multi-Test (sold separately) to provide a full testing system for your reef aquarium.
【 EASY TO USE 】: Full instructions are included detailing optimum levels and suggestions for correction, along with an integrated test tube rack. Simply follow the easy-to-read pictorial instructions and compare the test tube to the colour chart.
【 COMPACT & PORTABLE 】: The test kit is packaged in a compact cardboard box, providing convenience when conducting the tests, as well as when storing the tests. This guarantees a quick and easy response when your marine water needs testing.
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9.7
Exceptional
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9.7
Exceptional
NT Labs
NT Labs Marine Lab Multi-Test Kit (4 Key Parameters - Ammonia, Nitrite, Nitrate & pH), Marine Water Test Kit, Accurate Results, Liquid Drop Tests (Up to 155 Tests)
Check Price
Show More
Why we love it
Effortlessly assess key parameters.
Accurate and dependable results.
Easy and convenient use.
Main Highlights
【 4 IN 1 TEST KIT 】: Our multi-test kit enables marine aquarium owners to effortlessly assess 4 key water parameters using a single test kit. These tests include Ammonia, Nitrite, Nitrate and pH.
【 ACCURATE LIQUID DROP TESTS 】: All the tests are liquid drop tests from a dropper bottle to ensure the drops are the same size. This method of testing is significantly more precise compared to using dip strips. The use of liquid reagents guarantees accurate and dependable results for each parameter, simplifying the process of monitoring and maintaining ideal water conditions in your marine aquarium.
【 SUCCESSFUL FISH KEEPING 】This test kit reports concentration in terms of nitrogen (NH3-N), (NO2-N) or (NO3-N) to be compatible with reported safe concentrations as they apply to fish and plants. The Multi-Test is designed to be used alongside the Marine Reef Multi-Test (sold separately) to provide a full testing system for your reef aquarium.
【 EASY TO USE 】: Full instructions are included detailing optimum levels and suggestions for correction, along with an integrated test tube rack. Simply follow the easy-to-read pictorial instructions and compare the test tube to the colour chart.
【 COMPACT & PORTABLE 】: The test kit is packaged in a compact cardboard box, providing convenience when conducting the tests, as well as when storing the tests. This guarantees a quick and easy response when your marine water needs testing.
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3
NT Labs Aquarium Lab Multi Test Kit, All-in-one Water Testing Kit, Tests for Ammonia, Nitrite, Nitrate, pH, General Hardness (GH) & Carbonate Hardness (KH), Accurate Results (Up to 200 Tests)
NT Labs
27% Off
Why we love it
Efficient 6 in 1 testing.
Guarantees accurate liquid tests.
Perfect for freshwater aquariums.
Main Highlights
【 6 IN 1 TEST KIT 】: Our multi-test kit enables aquarium owners to effortlessly assess six key water parameters using a single test kit, including Ammonia, Nitrite, Nitrate, pH, General Hardness (GH) and Carbonate Hardness (KH).
【 ACCURATE LIQUID DROP TESTS 】: All the tests are liquid drop tests from a dropper bottle to ensure the drops are the same size. This method of testing is significantly more precise compared to using dip strips. The use of liquid reagents guarantees accurate and dependable results for each parameter, simplifying the process of monitoring and maintaining ideal water conditions in your aquarium.
【 SUITABLE FOR FRESHWATER AQUARIUMS 】: The main factor in successful fish keeping and health lies in the maintenance of good water quality. Ammonia, nitrite and pH levels in the aquarium should be checked regularly and our test kit makes it fun and simple to do so. This test kit reports concentration in terms of nitrogen (NH3-N), (NO2-N) or (NO3-N) to ensure compatibility with reported safe concentrations as they apply to fish and plants. The test kit is suitable for use in freshwater aquariums.
【 EASY TO USE 】: Full instructions are included, detailing optimum levels of the 6 key parameters and suggestions for correction, along with an integrated test tube rack. Simply add your aquarium water to the test tube and count the number of drops needed. The back of the box details clear pictorial instructions.
【 COMPACT & PORTABLE 】: The test kit is packaged in a compact cardboard box, providing convenience when conducting the tests, as well as when storing the tests. This guarantees a quick and easy response when your aquarium water needs testing.
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9.5
Superb
Check Price
9.5
Superb
NT Labs
NT Labs Aquarium Lab Multi Test Kit, All-in-one Water Testing Kit, Tests for Ammonia, Nitrite, Nitrate, pH, General Hardness (GH) & Carbonate Hardness (KH), Accurate Results (Up to 200 Tests)
27% Off
Check Price
Show More
Why we love it
Efficient 6 in 1 testing.
Guarantees accurate liquid tests.
Perfect for freshwater aquariums.
Main Highlights
【 6 IN 1 TEST KIT 】: Our multi-test kit enables aquarium owners to effortlessly assess six key water parameters using a single test kit, including Ammonia, Nitrite, Nitrate, pH, General Hardness (GH) and Carbonate Hardness (KH).
【 ACCURATE LIQUID DROP TESTS 】: All the tests are liquid drop tests from a dropper bottle to ensure the drops are the same size. This method of testing is significantly more precise compared to using dip strips. The use of liquid reagents guarantees accurate and dependable results for each parameter, simplifying the process of monitoring and maintaining ideal water conditions in your aquarium.
【 SUITABLE FOR FRESHWATER AQUARIUMS 】: The main factor in successful fish keeping and health lies in the maintenance of good water quality. Ammonia, nitrite and pH levels in the aquarium should be checked regularly and our test kit makes it fun and simple to do so. This test kit reports concentration in terms of nitrogen (NH3-N), (NO2-N) or (NO3-N) to ensure compatibility with reported safe concentrations as they apply to fish and plants. The test kit is suitable for use in freshwater aquariums.
【 EASY TO USE 】: Full instructions are included, detailing optimum levels of the 6 key parameters and suggestions for correction, along with an integrated test tube rack. Simply add your aquarium water to the test tube and count the number of drops needed. The back of the box details clear pictorial instructions.
【 COMPACT & PORTABLE 】: The test kit is packaged in a compact cardboard box, providing convenience when conducting the tests, as well as when storing the tests. This guarantees a quick and easy response when your aquarium water needs testing.
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4
Pawfly 5 in 1 Aquarium Water Master Test Kit, Aquarium Water Test Kit Fish Tank Water Testing Kit for pH Nitrite Nitrate Ammonia & Phosphate, Aquarium Test Kit for Freshwater & Saltwater Fish Tanks
Pawfly
15% Off
Why we love it
Monitors five essential water parameters.
Suitable for freshwater and saltwater.
Delivers professional-level accuracy consistently.
Main Highlights
5-in-1 Master Test Kit: Monitor all 5 critical water parameters – pH, nitrite, nitrate, ammonia, and phosphate – in one comprehensive aquarium test kit. The rigorous analysis helps you maintain an ideal haven for your aquatic friends.
Freshwater & Saltwater Application: This aquarium water master test kit works perfectly for both freshwater and marine fish tanks. Precise color-matching charts are included – simply compare your water’s hue to the color swatches for instant results.
Enhanced Accuracy: Using professional liquid reagents, the aquarium water test kit delivers high accuracy that far exceeds traditional test strips. Get laboratory-quality results every time, safeguarding a stable and enjoyable fish tank environment.
Regular Testing: Complete with 265 measurements across all parameters – pH (100), nitrite (45), nitrate (50), ammonia (30), phosphate (40). This fish tank water testing kit supports months of consistent monitoring to keep your aquarium perfectly balanced.
Essential Fish Care: Your trusted solution to prevent fish loss from fatal ammonia, nitrite buildup, or pH imbalances! Proper water quality maintenance ensures your aquatic pets stay healthy and your plants thrive in optimal conditions.
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9.4
Superb
Check Price
9.4
Superb
Pawfly
Pawfly 5 in 1 Aquarium Water Master Test Kit, Aquarium Water Test Kit Fish Tank Water Testing Kit for pH Nitrite Nitrate Ammonia & Phosphate, Aquarium Test Kit for Freshwater & Saltwater Fish Tanks
15% Off
Check Price
Show More
Why we love it
Monitors five essential water parameters.
Suitable for freshwater and saltwater.
Delivers professional-level accuracy consistently.
Main Highlights
5-in-1 Master Test Kit: Monitor all 5 critical water parameters – pH, nitrite, nitrate, ammonia, and phosphate – in one comprehensive aquarium test kit. The rigorous analysis helps you maintain an ideal haven for your aquatic friends.
Freshwater & Saltwater Application: This aquarium water master test kit works perfectly for both freshwater and marine fish tanks. Precise color-matching charts are included – simply compare your water’s hue to the color swatches for instant results.
Enhanced Accuracy: Using professional liquid reagents, the aquarium water test kit delivers high accuracy that far exceeds traditional test strips. Get laboratory-quality results every time, safeguarding a stable and enjoyable fish tank environment.
Regular Testing: Complete with 265 measurements across all parameters – pH (100), nitrite (45), nitrate (50), ammonia (30), phosphate (40). This fish tank water testing kit supports months of consistent monitoring to keep your aquarium perfectly balanced.
Essential Fish Care: Your trusted solution to prevent fish loss from fatal ammonia, nitrite buildup, or pH imbalances! Proper water quality maintenance ensures your aquatic pets stay healthy and your plants thrive in optimal conditions.
Show More
5
API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit
API
40% Off
Why we love it
High accuracy results provided.
Prevents fish loss.
Weekly monitoring use.
Main Highlights
Contains one API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit, including six bottles of testing solution, one colour card and four glass test tubes with cap
Measures levels of high range pH, ammonia and nitrate
Helps monitor and adjust pH and prevent invisible water problems that can be harmful to fish
Provides high accuracy results that ultimately prevent fish loss
Use for weekly monitoring and when water or fish problems appear
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9.2
Superb
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9.2
Superb
API
API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit
40% Off
Check Price
Show More
Why we love it
High accuracy results provided.
Prevents fish loss.
Weekly monitoring use.
Main Highlights
Contains one API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit, including six bottles of testing solution, one colour card and four glass test tubes with cap
Measures levels of high range pH, ammonia and nitrate
Helps monitor and adjust pH and prevent invisible water problems that can be harmful to fish
Provides high accuracy results that ultimately prevent fish loss
Use for weekly monitoring and when water or fish problems appear
Show More
6
Fish Tank Test Kit Freshwater Master Test Kit NT Labs Essential Kit
NT Labs
3% Off
Why we love it
200 tests, great value.
Integral test tube rack.
Covers essential water parameters.
Main Highlights
200 tests of the 6 key parameters.
Integral test tube rack for ease of use.
Freshwater Master Test Kit
Ammonia, Nitrite, Nitrate, pH, GH and KH.
Add your aquarium water to the test tube and count the drops needed, simple.
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9.1
Superb
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9.1
Superb
NT Labs
Fish Tank Test Kit Freshwater Master Test Kit NT Labs Essential Kit
3% Off
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Why we love it
200 tests, great value.
Integral test tube rack.
Covers essential water parameters.
Main Highlights
200 tests of the 6 key parameters.
Integral test tube rack for ease of use.
Freshwater Master Test Kit
Ammonia, Nitrite, Nitrate, pH, GH and KH.
Add your aquarium water to the test tube and count the drops needed, simple.
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7
API Liquid Saltwater Marine Master Test Kit
API
Why we love it
Highly accurate and economical.
Easy to read charts.
Over 550 tests included.
Main Highlights
COMPREHENSIVE WATER QUALITY MONITORING – The API Liquid Saltwater Marine Master Test Kit includes 7 essential tests for monitoring the key water parameters in your saltwater aquarium. These tests cover pH, ammonia, nitrite, nitrate, and more, giving you a complete picture of your aquarium's water quality. Ensuring balanced water conditions is critical for the health and stability of your marine environment.
PRECISE & RELIABLE RESULTS – This kit provides accurate results to help you easily detect imbalances and take corrective action. Each test includes a color-coded chart for easy interpretation, so you can quickly identify any issues with your tank's water chemistry. API’s trusted liquid testing formula ensures high accuracy and consistency with every use.
DESIGNED FOR SALTWATER AQUARIUMS – Specifically formulated for saltwater marine environments, this test kit allows you to monitor the delicate conditions of your tank. From reef tanks to fish-only systems, the API Saltwater Marine Master Test Kit is your go-to solution for ensuring optimal water conditions for all types of marine life.
LONG-LASTING & COST-EFFECTIVE – The API Liquid Saltwater Marine Master Test Kit is designed for frequent use, providing enough solution for multiple tests. With its large number of tests per bottle, you get extended value and long-term reliability. This kit ensures you don’t need to constantly buy refills, saving you both time and money.
EXPERTLY FORMULATED FOR ACCURATE RESULTS – API’s 50+ years of experience in the aquarium care industry is reflected in the high-quality formulation of this test kit. Every component is designed to deliver precise, dependable results, making it an essential tool for maintaining a healthy saltwater aquarium.
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9.0
Superb
Check Price
9.0
Superb
API
API Liquid Saltwater Marine Master Test Kit
Check Price
Show More
Why we love it
Highly accurate and economical.
Easy to read charts.
Over 550 tests included.
Main Highlights
COMPREHENSIVE WATER QUALITY MONITORING – The API Liquid Saltwater Marine Master Test Kit includes 7 essential tests for monitoring the key water parameters in your saltwater aquarium. These tests cover pH, ammonia, nitrite, nitrate, and more, giving you a complete picture of your aquarium's water quality. Ensuring balanced water conditions is critical for the health and stability of your marine environment.
PRECISE & RELIABLE RESULTS – This kit provides accurate results to help you easily detect imbalances and take corrective action. Each test includes a color-coded chart for easy interpretation, so you can quickly identify any issues with your tank's water chemistry. API’s trusted liquid testing formula ensures high accuracy and consistency with every use.
DESIGNED FOR SALTWATER AQUARIUMS – Specifically formulated for saltwater marine environments, this test kit allows you to monitor the delicate conditions of your tank. From reef tanks to fish-only systems, the API Saltwater Marine Master Test Kit is your go-to solution for ensuring optimal water conditions for all types of marine life.
LONG-LASTING & COST-EFFECTIVE – The API Liquid Saltwater Marine Master Test Kit is designed for frequent use, providing enough solution for multiple tests. With its large number of tests per bottle, you get extended value and long-term reliability. This kit ensures you don’t need to constantly buy refills, saving you both time and money.
EXPERTLY FORMULATED FOR ACCURATE RESULTS – API’s 50+ years of experience in the aquarium care industry is reflected in the high-quality formulation of this test kit. Every component is designed to deliver precise, dependable results, making it an essential tool for maintaining a healthy saltwater aquarium.
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8
AquaCare Essential Liquid Test Kit (Ammonia, Nitrite and pH), Aquarium Water Test Kit For Freshwater Fish Tanks (120 Tests)
AquaCare
Why we love it
Comprehensive water testing kit.
Promotes highly accurate results.
Ensures long-lasting usage.
Main Highlights
KIT INCLUDES - 3 test which includes ammonia, nitrate and pH. For each test you will have a regents, water testing tubes and a water care guide and manual.
HIGHLY ACCURATE TESTING - Test strips are great, but they are nowhere near as accurate as accurate as a liquid test kit that has a far more defined comparison scale
LONG LASTING - With the ability to carry out at least 120 tests this one test kit should last you several months
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9.0
Superb
Check Price
9.0
Superb
AquaCare
AquaCare Essential Liquid Test Kit (Ammonia, Nitrite and pH), Aquarium Water Test Kit For Freshwater Fish Tanks (120 Tests)
Check Price
Show More
Why we love it
Comprehensive water testing kit.
Promotes highly accurate results.
Ensures long-lasting usage.
Main Highlights
KIT INCLUDES - 3 test which includes ammonia, nitrate and pH. For each test you will have a regents, water testing tubes and a water care guide and manual.
HIGHLY ACCURATE TESTING - Test strips are great, but they are nowhere near as accurate as accurate as a liquid test kit that has a far more defined comparison scale
LONG LASTING - With the ability to carry out at least 120 tests this one test kit should last you several months
Show More
9
API 3-Pack Carbonate KH Test Kit for Aquariums, Helps Prevent Fish Stress from pH Shifts
API
Why we love it
Perfect for all fish tanks.
Easy and clear instructions.
Comes in a pack.
Main Highlights
Liquid test for fresh and saltwater
Helps detect stress on fish caused by rapid pH shifts, the result of low KH levels
Contains color chart, clear instructions and glass tube(s)
Pack of 3
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8.9
Excellent
Check Price
8.9
Excellent
API
API 3-Pack Carbonate KH Test Kit for Aquariums, Helps Prevent Fish Stress from pH Shifts
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Why we love it
Perfect for all fish tanks.
Easy and clear instructions.
Comes in a pack.
Main Highlights
Liquid test for fresh and saltwater
Helps detect stress on fish caused by rapid pH shifts, the result of low KH levels
Contains color chart, clear instructions and glass tube(s)
Pack of 3
Show More
10
NT Labs Aquarium Lab Mini-Test Kit (3 Key Parameters - pH, Nitrite and Ammonia), Maintain Excellent Water Quality, Accurate Results, Liquid Drop Tests (Contains 120 Tests Combined)
NT Labs
24% Off
Why we love it
Maintains excellent water quality.
Tests pH, nitrite, ammonia.
Easy-to-use instruction leaflet.
Main Highlights
【 MAINTAIN EXCELLENT WATER QUALITY 】: The key to successful fish keeping is excellent water quality. The NT Labs Aquarium Lab Mini-Test Kit measures three water parameters: pH, Nitrite and Ammonia.
【 AMMONIA TESTING 】: Ammonia is excreted by fish as a waste product. It is extremely toxic to fish and is broken down into less toxic nitrite by the beneficial bacteria in the filter of your aquarium.
【 NITRITE TESTING 】: Nitrite is produced by the beneficial bacteria in the aquarium and filters as they break down harmful ammonia excreted by fish. Although not as toxic as ammonia, nitrite is still very damaging to the health of the fish. Nitrite itself is broken down into nitrate which is significantly less harmful to fish.
【 pH TESTING 】: pH is the measure of the acidity or alkalinity of the water in your aquarium. The pH scale runs from 0 to 14. Very acid water is pH 0 and very alkaline water is pH 14. Neutral water that is neither acid nor alkaline is pH 7.
【 EASY TO USE 】: A full instruction leaflet is included in the pack which talks you through each parameter, what it should be, and what you should do if the readings are incorrect. This test kit reports concentration in terms of nitrogen (NH3-N) or (NO2-N) to be compatible with reported safe concentrations as they apply to fish.
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8.8
Excellent
Check Price
8.8
Excellent
NT Labs
NT Labs Aquarium Lab Mini-Test Kit (3 Key Parameters - pH, Nitrite and Ammonia), Maintain Excellent Water Quality, Accurate Results, Liquid Drop Tests (Contains 120 Tests Combined)
24% Off
Check Price
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Why we love it
Maintains excellent water quality.
Tests pH, nitrite, ammonia.
Easy-to-use instruction leaflet.
Main Highlights
【 MAINTAIN EXCELLENT WATER QUALITY 】: The key to successful fish keeping is excellent water quality. The NT Labs Aquarium Lab Mini-Test Kit measures three water parameters: pH, Nitrite and Ammonia.
【 AMMONIA TESTING 】: Ammonia is excreted by fish as a waste product. It is extremely toxic to fish and is broken down into less toxic nitrite by the beneficial bacteria in the filter of your aquarium.
【 NITRITE TESTING 】: Nitrite is produced by the beneficial bacteria in the aquarium and filters as they break down harmful ammonia excreted by fish. Although not as toxic as ammonia, nitrite is still very damaging to the health of the fish. Nitrite itself is broken down into nitrate which is significantly less harmful to fish.
【 pH TESTING 】: pH is the measure of the acidity or alkalinity of the water in your aquarium. The pH scale runs from 0 to 14. Very acid water is pH 0 and very alkaline water is pH 14. Neutral water that is neither acid nor alkaline is pH 7.
【 EASY TO USE 】: A full instruction leaflet is included in the pack which talks you through each parameter, what it should be, and what you should do if the readings are incorrect. This test kit reports concentration in terms of nitrogen (NH3-N) or (NO2-N) to be compatible with reported safe concentrations as they apply to fish.
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