The Terra aquatica pH test kit is very reliable, easy to use and cost-effective. It replaces expensive pH meters and is suitable for at least 500 tests. The pH test kit covers a range from 4.0 to 8.5 and is ideal for simple pH tests. It is easy to use: fill the test tube halfway with nutrient solution, add 2-3 drops of the pH test indicator, shake and compare the coloration with the enclosed table.