ORP ST20R Starter Pen Meter from Ohaus

Ohaus 30073985

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After more than a century of perfecting the art of measurement through our durable weighing products, OHAUS precision is now available in a line of pen meters that provide accurate measurement of pH, oxidation-reduction potential (ORP), conductivity, salinity, and total dissolved solids (TDS). Starter pen meters are the economical option when you are simply looking for meters that will provide accurate measurement without restriction.


pH, oxidation-reduction potential (ORP), conductivity, dissolved oxygen (DO), salinity, total dissolved solids (TDS), temperature measurement


Liquid crystal display (LCD) display with secondary information line (on select models)


4 1.5V batteries (included)




ABS Housing

Design Features

Easily replaceable electrodes, automatic shut off feature


Meter Type: ORP

Measurement Range: -1000 – 1000 mV; 0.0 – 99.0 °C; ± 2 mV / ± 0.5 °C

Measurement Resolution: 1 mV

Display: LCD

ATC: Yes

Temperature Compensation:Automatic

Accuracy ± (mV): 2 mV

Accuracy ± (Temperature): 0.5 °C

Automatic Shutdown: Yes, After 6 minutes of non-use

Battery Life: 200 Hours with Disposable Batteries

Calibration: N/A

Dimensions (HxLxW): 7.28 in x 1.5 in x 1.77 in (185 mm x 38 mm x 45 mm)

Measurement Range (Temperature): 0 °C – 99 °C

Measurement Range: -1,000 mV – 1,000 mV

Net Weight: 3.88 oz (110 g)

Number of Buttons: 2

Power: 4 AG13 Batteries (Included)

Protection Rating: IP67

Temperature Display: Yes

Temperature Sensor: 50 KΩ NTC

Working Environment: 50°F – 104°F, 85%RH, non-condensing (10°C – 40°C, 85%RH, non-condensing)

Wrist Strap: Yes

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