1.Measuring range: PH: 0.00-14.00 PH 2.TDS range: 0-9990 PPM 3.Temperature: 0.1°C-80.0°C 4..Automatic temperature compensation: 0.1°C-80.0°C 5.Battery: 3 1.5 V( AG-13 button cell) 6.Operation temperature: 0-80°C 7..Calibration: Automatic two point calibration 8.Auto shut off function: 4 minutes 9.Size: 183mm 37mm*37mm 10.Weight: 80g Operation Steps; 1.Remove the protective sleeve 2.Clean the Electrode with distilled water and wipe clean the spare water. 3..Press the "ON/OFF" button to turn on the meter. 4.Immerse the PH meter electrode in the solution 5. Shake the meter lightly, read the data when the numeric stabilized. The temperate displays at the bottom of the screen . 6. Press the "ON/OFF" button to shut off the instrument . Clean the electrode with pure water , cover the electrode protective sleeve. What's in the box 1 x Tester,buffer solution & instruction manual