20+20 Test tablets for 02 and Ph.Instructions for using the TESTER Oxygen – pH, for testing active oxygen (tablets and granulates)1. Remove the lid (see picture 1) and rinse out the compartments with the swimming pool water to be tested.2. Fill all compartments to the top with the swimming pool water to be tested. This is conveniently done by scooping up the water from a few inches below the surface.3. Add one PHENOLRED tablet to the left hand compartment by tearing open the foil strip (see picture 2) without touching the tablets with your fingers.4. Add one DPD No. 4-tablet to the right hand compartment by tearing open the foil strip (see picture 2) without touching the tablet with your fingers.5. Replace the lid of the TESTER with the arrows pointing towards to printed front.6. The tablets will quickly disintegrate. Invert the TESTER several times to mix the contents thoroughly.7. Take the readings by holding the TESTER towards natural daylight. Select the nearest colour mat