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Extech RE300: ExStik® ORP Meter

ORP meter with rugged flat surface ORP electrode and high resolution of 1mV


  • Measures ORP/Redox from -999 to 999mV
  • Automatic electronic self calibration
  • Simulated analog bargraph displays change in ORP reading
  • High resolution of 1mV
  • Memory stores and recalls 15 readings and saves last calibrated value
  • Data validation indicators show user the reading is stabilized
  • Data Hold, Auto shut-off and low battery indication


Specifications Range
ORP (mV) -999 to 999mV
Max Resolution 1mV
Basic Accuracy ±4mV
Memory 15 readings
Dimensions/ Weight 1.4×6.8×1.6″ (35.6×172.7×40.6mm)/ 3.8oz (110g)


RE300_English Datasheet

RE300_English User’s Manual

RE300_CE Declaration of Conformity