Starter 400 Ohaus ST400D PH Meter

Starter 400 Ohaus ST400D PH Meter

The Starter 400 Ohaus ST400D PH Meter is a highly reliable instrument engineered to measure dissolved oxygen (DO) and temperature with excellent precision. Because of its portable design and user-friendly interface, this meter is ideal for laboratories, field researchers, and environmental professionals who require consistent and accurate data. Moreover, its modern display and smart compensation system make it exceptionally easy to operate even under challenging conditions.

Key Features

The ST400D offers a broad measurement range from 0.00 to 20.0 mg/L (ppm) for dissolved oxygen and 0°C to 50°C for temperature, ensuring adaptability for various applications. Furthermore, it provides high accuracy, with ±0.2 mg/L for readings below 8 mg/L and ±0.3 mg/L for those between 8–20 mg/L. The temperature accuracy of ±0.3°C enhances reliability, allowing users to obtain consistent readings even when environmental conditions fluctuate.

This model comes equipped with the STDO21 electrode, which offers high sensitivity and fast response for precise readings. In addition, the automatic temperature compensation (ATC) continuously adjusts measurements based on temperature changes, ensuring that results remain stable and accurate. The color LCD graphic display presents data clearly and intuitively, enabling easy operation in both bright and dim environments.

Moreover, the lightweight and ergonomic design enhances portability, making it suitable for both laboratory and fieldwork. Powered by four AAA disposable batteries, the ST400D provides up to 12 hours of continuous operation, allowing for extended use without frequent replacements. Because it supports two-point calibration, users can maintain long-term accuracy with minimal effort.

Technical Specifications

• Model: Ohaus Starter ST400D DO Meter

• Measurement Range (DO): 0.00 – 20.0 mg/L (ppm)

• Measurement Range (Temperature): 0°C – 50°C

• Accuracy (DO): ±0.2 mg/L (<8 mg/L); ±0.3 mg/L (8–20 mg/L)

• Accuracy (Temperature): ±0.3°C

• Resolution (DO): 0.01 mg/L

• Temperature Resolution: 0.1°C

• Display: Color LCD Graphic Display

• Electrode: STDO21 (Included)

• Temperature Compensation: Automatic (10 KΩ NTC Sensor)

• Battery Life: 12 hours (4 AAA Batteries Included)

• Power Supply: 4 × AAA (LR03) Batteries

• Calibration: 2-Point Calibration

• Net Weight: 0.35 lb (0.16 kg)

• Dimensions (L × H × W): 5.91 × 1.38 × 3.54 in (150 × 35 × 90 mm)

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

• Measured Parameters: Dissolved Oxygen (DO) / Temperature

Applications

The Ohaus ST400D is perfect for water-quality testing, aquaculture management, wastewater treatment, and environmental research. Since it delivers quick stabilization and accurate results, it enables efficient dissolved oxygen measurement in rivers, lakes, and laboratory samples. Additionally, the vivid color LCD display and straightforward calibration process make it suitable for technicians, educators, and field scientists who value reliability and simplicity.