Portable PH/TDS/EC/TEMP Four-in-one Test Pen Multi-function Water Quality Detector Conductivity With Backlight

TDS/PH/EC/thermometer 4 in 1 (with backlight) Measuring range: pH: 0.00-16.00 ph; TDS: 0-19990 ppm; EC: 0-19990 μs/cm Resolution: 0.01 ph; 1 ppm; 1 μs/cm; 0.1 ° C; 0.1 °F Accuracy: ph: +/- 0.01 ph; TDS/EC: +/- 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 μs/cm; EC: 1413 μs/cm Auto off: 5 minutes