Ohaus pH & Conductivity Meter ST400M-F Portable

Ohaus ST400M-F Portable pH & Conductivity Meter

The Ohaus Starter 400M-F is a rugged, waterproof, and battery-operated multi-parameter meter designed for reliable field testing. With IP67-rated housing and probes, it is built to perform in harsh outdoor environments. This portable instrument measures pH, conductivity, TDS, resistivity, salinity, ORP, and temperature with high accuracy. Featuring a rechargeable lithium battery, USB connectivity, and data storage for up to 1000 entries, the ST400M-F is ideal for demanding water analysis applications.

Features

• Multi-parameter functionality: measures pH, conductivity, TDS, resistivity, salinity, ORP, and temperature

• Waterproof IP67 housing and probes with protective rubber cover for reliable field performance

• Backlit LCD for clear visibility in all lighting conditions

• Rechargeable lithium battery provides up to 40 hours of continuous operation

• Built-in USB port for simple data transfer and storage capacity of up to 1000 items

• Includes ST320 pH electrode (IP67, 3 m cable) and STCON3 conductivity electrode (IP67, 3 m cable)

Specifications

• Model: ST400M-F

• Parameters: pH, conductivity, TDS, resistivity, ORP (mV), salinity (psu), temperature

• pH range: -2.00 – 16.00; resolution: 0.01; accuracy: ±0.01

• Conductivity range: 0.01 μS/cm – 199.9 mS/cm; accuracy: ±0.5%; resolution: variable 0.1 – 199.9 μS/cm

• TDS range: 0.1 mg/L – 199.9 g/L; resolution: 0.01 mg/L

• Resistivity range: 0 – 20 MΩ•cm; resolution: 0.01 MΩ•cm

• ORP range: -1999 – 1999 mV; accuracy: ±1 mV; resolution: 1 mV

• Salinity range: 0 – 99.9 psu; resolution: 0.01 psu

• Temperature range: -5 °C – 110 °C; accuracy: ±0.3 °C; resolution: 0.1 °C

• Temperature compensation: automatic; sensor: 30 KΩ NTC

• Display: backlit LCD

• Battery life: up to 40 hours (rechargeable lithium battery)

• Data storage: up to 1000 entries

• Communication: built-in micro-USB port

• Dimensions (L × H × W): 230 × 40 × 100 mm (9.05 × 1.57 × 3.94 in)

• Net weight: 0.35 kg (0.77 lb)

• Operating environment: 5 °C – 40 °C (41 °F – 104 °F), up to 80% RH, non-condensing

Applications

• Environmental monitoring and field water testing

• Industrial water quality control

• Educational and research laboratories

• On-site multi-parameter testing in rugged environments

Conclusion

The Ohaus Starter 400M-F Portable pH & Conductivity Meter combines waterproof durability, multi-parameter versatility, and practical data management features. With its robust IP67 design, rechargeable battery, and USB connectivity, it is an excellent solution for accurate water quality analysis in the field.