Battery: 3x1.5V (-13) (with battery) Temperature Compensation: 0-50 Operating Temperature: 0-50 Weight:110g Dimensions: 183x43x26mm OPERATION: 1. Remove the protective cap. Turn on the meter. 2. Clean the electrode with distilled water, and dry up the water attached to the electrode with filter paper. 3. Immerse the electrode in the solution to be tested. 4. Stir gently and wait for the reading to stabilize. Do not tap it against the glass. 5. Short press the "MODE" button, choice the pH/EC/TDS/SALT/S.G for measuring. 6. After use. Turn off the meter. Rinse the electrode with distilled water to minimize contamination . 7. Always replace the protective cap after use. Switching Temperature Modes: Short press the "TEMP/CAL" button to switch between Celsius and Fahrenheit. Note:the instrument has memory function,the boot mode is last time shutdown mode. Colour:As Shown Material:ABS Package Contents: 1 * Versatile Digital pH Meter 1 * English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.