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Ohaus ST20M Pocket pH & Conductivity Meter - 30393200


The Ohaus ST20M Pocket pH & Conductivity Meter is a multi parameter pen meter that directly measures pH, conductivity and temperature, as well as provides conversion measurements for TDS and Salinity. These fully waterproof pen meters combine measurement capabilities of two testers in one convenient pocket-sized unit.

Great for water, laboratory or plant use, the ST20M features a single junction pH electrode and a pin-style conductivity probe for longer usage and durability. The replaceable electrode module saves you money by reusing the meter body. Advanced features include auto-shutoff, low battery indicator, and simple and easy calibration.

  • Measures 5 parameters including pH, Conductivity, TDS, Salinity, and Temperature
  • Waterproof rated to IP67
  • Automatic Temperature Compensation
  • Auto shutoff with low battery indicator
  • ST20M meter includes electrode, protective sensor cap, four AG13 1.5V batteries, and wrist strap
Part Number: 30393200
Attribute nameAttribute value


Model :ST20M-C
pH Range :0.00 to 14.00 pH
pH Resolution :0.01 pH
Conductivity Range :0 to 19.99 mS/cm
Conductivity Resolution :0.01 mS/cm
Temperature Range :0.0 to 99.0 °C
Temperature Resolution :0.1 °C
Salinity Range :0.0 to 10.0 ppt
Salinity Resolution :0.1 ppt