Compact design for fast, convenient electrochemistry measurement at your fingertips.

• LCD display
• Four 1.5 V batteries (included)
• Easily replaceable electrodes
• Automatic shut-off
• Features a 3-point calibration

OHAUS® precision is now available in a line of pen meters that provide accurate measurement of pH, 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.

Model ST20M-B: Conductivity Range: 0 – 1999 μs/cm; 0.0 – 99.0 °C; pH Range: 0.00 – 14 pH; TDS Range: 0.0 – 1000 mg/L;
Model ST20M-C: Conductivity Range: 0 – 1999 μs/cm; 0.0 – 99.0 °C; pH Range: 0.00 – 14 pH; Salinity Range: 0.0 – 10.0 ppt