HM Digital ORP-200 Waterproof ORP Meter

HM Digital ORP-200 waterproof ORP & temperature meter. For water purification applications.

£65.15 £54.29
In stock
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ORP, or Oxidation Reduction (redox) Potential is a measurement of water's ability to oxidise contaminants. The higher the ORP, the greater the number of oxidising agents.

This meter is ideal for all ORP & temperature testing, including anti-oxidant measurement, water purification applications, ionizers, agriculture, aquariums & aquaculture, chlorine monitoring, cooling tower disinfection, environmental testing, fruit & vegetable washing, hydroponics, metal finishing, ozone system monitoring, pharmaceutical & medical applications, pools & spas, pulp bleaching, vineyards & wineries and water treatment.


  • Measures Oxidation Reduction Potential (Redox) and Temperature
  • Auto-ranging calibration with digital fine tuning
  • Includes storage solution in a sponge embedded in a clear cap
  • Waterproof housing (IP-67 rating)
  • Simultaneous temperature display
  • Digital Calibration (push button)
  • Auto-off function, data-hold function and low-battery indicator.
  • Display: large and easy-to-read LCD screen includes simultaneous temperature reading.
  • Replaceable Sensor (model SP-O2)
  • Factory Calibrated: The ORP-200 meter is factory calibrated to +92 mV The meter can be easily recalibrated with digital calibration using the push buttons, rather than a screwdriver.
  • Includes a cap, batteries, and lanyard

Technical Information:

  • ORP Range: -999 to +1000 mV 
  • Temperature Range: 0-80°C; 32-176°F 
  • Resolution: 1 mV; Temperature resolution is 0.1°C/F 
  • Accuracy: 0.5% (+/-2mV) 
  • Calibration: Digital calibration by push button. 
  • Electrode: Replaceable glass sensor and reference tube electrodes 
  • Housing: IP-67 Waterproof (submersible; floats) 
  • Power source: 3 x 1.5V button cell batteries (LR44 or equivalent; included) 
  • Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches) 
  • Weight: 96.4 g (3.4 oz)
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