Terra Aquatica pH Test Kit for 500 Tests (4.0 to 8.5 pH)

This pH test kit is perfect for a quick overview of your pH level. 
It covers a pH-range from 4.0 to 8.5pH.
Simply fill the test-tube halfway with your nutrient solution, add 2 - 3 drops of the Terra Aquatica pH indicator solution,
then shake and observe the resulting color.
Compare with the color chart to check your pH level.

Very reliable, simple to use and cheap, the pH Test kit advantageously replaces the expensive pH meters.
Good for at least 500 tests