Specifications: Condition: 100 Percent Brand New Material: Plastic + Metal Color: Gray White Size: approx. 18 x 11.6 x 3.1cm / 7.1 x 4.6 x 1.2 Power Supply: 1 x 1.5V AA Batteries(not included) Package Weight: 220g Quantity: 1pc Package Included: 1 x Water Quality Tester Attention: 1. Please dont immerse the probe in any liquid other than pool or spa water. 2. Please rotate the switch to close position when not in use. 3. Please store the tester in cool and dry place. Usage: Before you use this tester for the first time, you must adjust it to match your swimming pool or spa water with the following sequence: 1. Test your pool or spa water using a conventional liquid test kit 2. Record the chlorine reading level as you will need. 3. No adjustment is required for pH. How to find adjustment point for chlorine testing: 1. Hold the tester in one hand and the probe in the other. 2. Insert the cleaned metal probes into the water up to black band. 3. With the probe still in the water, turn the wheel on the face of the tester all the way to the left towardsCL. Slowly turn the wheel back to the right until the needle matches the chlorine level you recorded with the convention liquid tester(e.g.: 1.5ppm) 4. Remove probes from the water without touching the wheel. Indicator will move all the way to the right and stop on a letter between A and E. This letter is your adjustment point. Note: Any time you use this tester to test the chlorine level, you must adjust it to the adjustment point before testing.