The tester is used to test the active chlorine and pH value in pool water. The DPD tester works on the principle of visual comparison with a color sample next to the dosing point - after adding tablets (chlorine/pH) the water turns colored, then the chlorine/pH value in the pool needs to be corrected.
 How to use:
 Remove the cover from the pool, fill it with pool water to the top. Then directly place the appropriate tablets in the appropriate compartments. Close the cover, shake gently and after a while compare the colors of the pool tester with the color of the water.

 The package comes with:
 Tester
 20 tablets of DPD
 20 tablets PHENOL RED