ORP meter,Pen-type ORP meter, Pocket-size ORP meter Easy to Change Electrode Temperature Measurement (C/F) IP67 Waterproof protection Auto Calibration for 0mV , 500mV High Input Impedance LCD with two displays and bar graph indicator Data hold function Auto power off 100 point datalogger with recall Display LCD Size: 20mm x 28mm Measurement Range mV = ±600mV OR ±1200mV Temp = 0 to 50ºC (32 to 122ºF) Resolution mV = 1mV Temp = 0.1ºC / 0.1ºF Accuracy mV = ± 1mV Temp = ± 0.8ºC / ± 1.5ºF ORP Electrode Included ORP Temp Compensation Automatic temperature compensation Data Hold Freeze the display reading ORP Calibration ORP 0mV, 500mV (2 points)