Test chlorine level: Recommended chlorine level for swimming pools and spas: 1.2~1.7ppm. 1. Position the rod at your "adjustment point". 2. Holding the tester in one hand and the samples in the other, insert the samples into the water towards the top of the black strap. Don't wait for needle scraps for a better chlorine reading. 3. Leave the samples in the water. pH level: Recommended pH level for swimming pools and spas: 7.2~7.8. 1. With samples in water, the wheel spins all the way to "pH" until it clicks (battery must be turned off to read pH). 2. Wait until the remnants of the needle end up on the pH reading. 3. Soft tests and insert into the holder on the side of the tester for storage.Use Before using this tester for the first time, you must adapt it to your swimming pool or spa in the following order: 1 Test your pool or spa with a traditional liquid test kit 2. Record the chlorine reading level as needed. 3. The pH does not need to be adjusted. How to find the adjustment point for the chlorine test: 1. Insert 1 piece of AA 1.5v battery into the handle compartment. 2. Hold the tester in one hand and the probe in the other. 3. Insert the washed metal probe into the water until the black band is reached. 4. Gently stir the water with the probe. 5. Turn the surface wheel of the tester all the time to the left in the key direction while the probe is still in the water. Slowly turn the wheel to the right until the needle matches the amount of chlorine you recorded with a regular liquid tester (for example: 1.5ppm). 6. Remove the probe from the water without touching the wheel. The indicator will move to the right all the time and stop on a letter between a and E. This letter is your set point.