API GH & KH TEST KIT Freshwater Aquarium Water Test Kit 1-Count

Superb product. API is one of my resources for many of my aquarium essentials. Never had any problem with any of there items. Great value for money, with many products giving you size options for what you need. All products from medicated to water parameters and plant care. These products are made with an ease of understanding for what that purpose is and will help you on your fish keeping journey.

This API GH & KH test kit is a must-have for any freshwater aquarium owner. It's easy to use and gives clear, reliable readings for general and carbonate hardness. Keeping these levels balanced is crucial for fish health. Highly recommend for maintaining a stable tank environment

Seems to be OK but I don't know how accurate the test results are - I have to rely on them being accurate.

We use rain water for replacing the water in our aquariums, which naturally is very clear unlike our tap water at times. One problem however is that rain water lacks nutrients and carbonate hardness, so I need to add supplements. This GH and KH kit lets me keep an eye on these levels. The kit includes two bottles and two test tubes with caps. At a first glance it appears simple to use, i.e. with a 5ml sample in the test tube, add a drop of solution, cap and shake, then repeat until the colour changes. In reality, the cap is very stiff to place on the test tube. After repeating the steps a few times, some liquid ran down the outside of the test tube and as I tried capping it, it slipped from my fingers, flew across the table and smashed on the floor. Once I managed to test the KH and GP and using a paper towel to dry the test tubes before capping after each drop, the test reading itself is very simple - The colour changes from blue to yellow for the KH reading or from green to yellow for the GH reading. It includes a chart that shows the readings for the number of drops added. Personally I would prefer if it included a bung instead of a cap as it is quite tedious trying to pull off and replace the stiff cap after each drop, particularly when it can take 6 to 9 drops to complete each test. The guide mentions that the bottles must be held vertically upside down for accuracy, so I'm not sure about the accuracy with being unable to fully invert the bottle without it releasing multiple drops. With other test kits, I need to squeeze the bottle to release drops, where as the bottles with this kit starts releasing drops before it is fully inverted. There is also a warning to wear protective gloves, protective clothing, eye protection and face protection and to only use outdoors or in a well-ventilated area.

Great item to test ph levels in water, especially when tap water is soft water

Great value for accurate results. The instructions can be abut misunderstood but after searching some forums online, it’s easy to understand.

Never failed. I always have this testing kit on hand.

I've found this test to be easy to use and it is fun observing the colour changes. My tapwater and most clean local water sources seem to be rather hard at 10 degrees GH. I am using collected rainwater (measuring under 2 degrees GH) to dilute my tapwater and bring the hardness down. I did ask a friend to bring me water in a container as his water is soft at 3 degrees GH. However the pH of his water is high at 7.8 and as my fish prefer soft acid conditions I think a pH of 7.8 may be undesirable. I'm unsure why I should measure KH as well but I have done so for completeness and this test is just as simple.