Adjustment Points: Before first use, adjust the tester for the pool or spa water to be tested in the following order: 1. Test the pool or spa water with traditional liquid testing tools; 2. Record the chlorine reading for backup ( 1.5PPM); 3. No need to adjust PH. To find the tester's adjustment point: A. Place an AA 1.5 V battery (positive side up) in the battery compartment of the handle. B. Hold the tester in one hand and the test stick in the other. C. Insert the cleaned metal rod into the water to the black position. D. Gently stir the water with a metal rod. E. When the metal rod is kept in the water, turn the knob on the front of the watch to the CL direction until it can no longer move. Then slowly back to the right until the pointer points to the position of the result measured by the traditional liquid test tool (eg 1.5). F. Remove the test rod from the water, being careful not to move the knob. The pointer will slide to the right, stopping at a letter between A and E. This letter is the adjustment point. NOTE: The meter must be adjusted to the "adjustment point" before each chlorine test. Test pH: The recommended chlorine level for swimming pool or spa water is 7.2 to 7.8 A) With the test stick in the water, turn the knob in the pH direction until it beeps (the battery must be removed to read the pH). B) Wait until the pointer stops wiggling and take a pH reading. C) Gently dry the test stick, insert it into the slot next to the tester, and store it. Test for chlorine levels: 1.2 to 1.7ppm recommended for swimming pool or spa water A) Move the pointer to the "adjustment point" position. B) Holding the tester in one hand and the test rod in the other, insert the metal rod into the water to the black position. Wait until the pointer stops swinging to take the reading. C) Let the test stick stay in the water and continue the pH test according to the instructions. Specifications1. Essential tools for swimming pools, saunas and spas2. Ideal tool for simple measurement of pH and C12 values in water3. Chemical-free, no more guesswork in measuring4. Chlorine level within safe measurement range: 1.2-1.7ppm5. PH level within safe measurement range: 7.2-7.86. Battery: Use 1 AA batteryStorage method:In order to prolong the service life of the swimming pool tester PC-101 and ensure the measurement, please note: 1. When not in use, please turn the knob to the off position (to the direction of PH until it can no longer move). 2. Store in a cool, dry place, avoid direct sunlight. 3. Do not immerse the test rod in other liquids except swimming pool water and hot spring water. 4. Regularly check that the battery is fully charged - the tester uses an "AA" 1.5 V alkaline battery