Ohaus ST20M-C Pen Meter, 1 Item OHAU30393200

The Ohaus ST20M-C Pen Meter (part number OHAU30393200) is a waterproof multi-parameter portable instrument designed to measure pH, conductivity, temperature, total dissolved solids (TDS), and salinity in water and laboratory samples.

Key Features:

• Measures 5 parameters: pH (0.00–14.00), Conductivity (0.00–19.99 mS/cm), Salinity (0.0–10.0 ppt), Temperature (0–99.0 °C), and TDS (not applicable)
• pH resolution: 0.01 pH; pH accuracy: ±0.05 pH
• Conductivity resolution: 0.01 mS/cm; conductivity accuracy: ±2% Full Scale
• Salinity resolution: 0.1 ppt; salinity accuracy: ±2% Full Scale
• Temperature resolution: 0.1 °C; temperature accuracy: ±0.5 °C
• Automatic Temperature Compensation (ATC) active from 0–45 °C
• Waterproof rating IP67 (fully protected against dust and temporary immersion)
• Dimensions: 185 × 42 × 37 mm; Weight: 105 g
• Electrode type: Single-junction pH electrode and pin-style conductivity probe; electrode is replaceable
• Power: 4 × 1.5 V batteries with approximately 100 hours of operation
• Calibration: pH 3-point calibration, Conductivity 1-point calibration

Advantages:

• Multi-parameter measurement capability consolidates five tests into one compact, portable pen meter
• High pH resolution and accuracy ensure precise acidity/alkalinity monitoring critical in lab and field analysis
• Conductivity and salinity measurements with reliable ±2% full-scale accuracy support water quality assessment
• Waterproof IP67 rating provides durability and use in wet environments without damage risk
• Automatic Temperature Compensation improves measurement reliability across varying sample temperatures
• Compact size and light weight facilitate easy handling and portability for field and lab applications
• Replaceable electrodes reduce operating costs by allowing sensor renewal without replacing the entire unit