Starter 400 Ohaus ST400M-G PH & Conductivity

Starter 400 Ohaus ST400M-G PH & Conductivity

The Starter 400 Ohaus ST400M-G PH & Conductivity is an advanced portable meter designed for professionals who require reliable and precise measurement of pH, conductivity, resistivity, total dissolved solids (TDS), salinity, millivolt (mV), and temperature. Because it combines versatility, accuracy, and portability, this model is ideal for laboratories, water-treatment facilities, aquaculture, and field-based environmental testing.

Key Features

The ST400M-G provides a comprehensive measurement range that covers –2.00 to 16.00 pH, 00.0 μS/cm to 199.9 mS/cm conductivity, 0–20 MΩ·cm resistivity, and –5°C to 110°C temperature. Moreover, it achieves high accuracy of ±0.01 pH, ±0.5% full scale (F.S.) for conductivity, ±1 mV, and ±0.3°C, ensuring dependable results across multiple applications.

This model includes both the ST320 IP67 pH electrode and the STCON3 IP67 conductivity electrode, each featuring 3-meter waterproof cables. As a result, it provides durability and flexibility for demanding outdoor or wet conditions. In addition, the automatic temperature compensation (ATC) feature adjusts readings in real time, guaranteeing accuracy even under fluctuating temperatures.

The LCD backlit display enhances readability in various lighting environments, while the rechargeable battery delivers up to 40 hours of continuous use, making it perfect for extended field operations. Furthermore, its lightweight and ergonomic design—weighing only 0.77 lb (0.35 kg)—ensures comfortable handling during prolonged use.

Technical Specifications

• Model: Ohaus Starter ST400M-G pH & Conductivity Meter

• Measurement Range (pH): –2.00 to 16.00

• Measurement Range (mV): –1999 to +1999

• Measurement Range (Temperature): –5°C to 110°C

• Measurement Range (Conductivity): 00.0 μS/cm – 199.9 mS/cm

• Measurement Range (Resistivity): 0 – 20 MΩ·cm

• Measurement Range (TDS): 0.1 mg/L – 199.9 g/L

• Measurement Range (Salinity): 0 – 99.9 psu

• Accuracy: ±0.5% F.S.; ±0.3°C; ±1 mV; ±0.01 pH

• Resolution: 0.01 pH; 0.01 psu; 0.1°C; 0.01 mg/L; 0.01 MΩ·cm; 1 mV

• Display: LCD Backlit Display

• Electrodes: ST320 IP67 (pH) + STCON3 IP67 (Conductivity), 3 m each

• Temperature Compensation: Automatic (30 KΩ NTC Sensor)

• Battery Life: 40 hours (Rechargeable)

• Power Supply: Rechargeable Battery (Included)

• Net Weight: 0.77 lb (0.35 kg)

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

• Working Environment: 5°C – 40°C, 80% RH, non-condensing

• Measured Parameters: pH / Conductivity / Resistivity / TDS / Salinity / mV / Temperature

Applications

The Ohaus ST400M-G is widely used in environmental monitoring, laboratory testing, wastewater management, aquaculture control, and chemical research. Because it supports multiple measurement modes in a single device, it eliminates the need for several separate instruments, saving time and simplifying workflows. Additionally, its dual waterproof electrodes and long battery life make it dependable for on-site testing under harsh or humid conditions.