TDS/PH//thermometer 4 in 1 Measuring range: pH: 0.00-16.00 ph; TDS: 0-19990 ppm; : 0-19990 s/cm Resolution: 0.01 ph; 1 ppm; 1 s/cm; 0.1 C; 0.1 F Accuracy: ph: +/- 0.01 ph; TDS/: +/- 2%; temperature: 0.5 C Battery: 3*1.5V LR44 button battery (not included) Temperature: 0.1-60.0 C; 32.0-140.0 F Calibration: ph: three-point automatic calibration (6.86 & 4.00&9.18 ph); TDS: 1413 s/cm; : 1413 s/cm Auto off: 5 minutes Colour:Photo Color Material:ABS Package Contents: 1 x PH meter(3X LR44 Battery Not Included) 1 x 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.