ORP meter ExStik ORP Meter RE300 High resolution of 1mV à¤Ã×èͧÇÑ´âÍÍÒ¾Õ ORP meter ExStik ORP Meter • Measures ORP from -999 to 999mV with high resolution of 1mV and ±4mV accuracy • Automatic electronic self calibration • Simulated analog bargraph displays change in ORP reading • Memory stores and recalls 15 readings and saves last calibrated value • Data validation indicators show user the reading is stabilized • Large 3-1/2 digit (2000 count) Digital display with bargraph • Data Hold, Auto shut-off and low battery indication • Easy to replace electrode module is interchangeable with pH and chlorine ExStik® modules; (built in chip automatically recognizes the type of probe plugged in for specific measurements)