Starter 300 Ohaus ST300D-B DO Meter

Starter 300 Ohaus ST300D-B DO Meter

The Starter 300 Ohaus ST300D-B DO Meter is a portable, user-friendly instrument designed for accurate measurement of dissolved oxygen (DO) and temperature in water and liquid samples. It provides dependable performance for professionals working in environmental monitoring, aquaculture, wastewater treatment, and education. With its compact and ergonomic design, this model ensures convenience without compromising measurement precision.

Key Features

The ST300D-B offers a wide measurement range of 0.00–19.99 mg/L (0–400%) and 0–50°C, making it suitable for a broad range of applications. It delivers high accuracy of ±1% or ±0.3 mg/L for DO and ±0.3°C for temperature, ensuring precise and repeatable results even in variable environmental conditions.

Its LCD display clearly shows measurement results in multiple formats such as mg/L, ppm, or % saturation, allowing for easy data interpretation. The meter supports two-point calibration, ensuring accurate readings across different concentrations and environments. In addition, the automatic temperature compensation (ATC) feature corrects measurements in real time to maintain reliability under changing temperatures.

The STDO11 dissolved oxygen electrode and STTEMP30 temperature probe are available as optional accessories, giving users flexibility to replace or upgrade components as needed. Moreover, the meter operates using four AAA (LR03) batteries, offering up to 250 hours of continuous use, ideal for field applications where access to power may be limited.

Technical Specifications

• Model: Ohaus Starter 300D-B (ST300D-B) Dissolved Oxygen Meter

• Measurement Range (DO): 0.00 – 19.99 mg/L; 0% – 400%; 0 ppm – 45 ppm

• Temperature Range: 0°C – 50°C

• DO Accuracy: ±1% or ±0.3 mg/L

• Temperature Accuracy: ±0.3°C

• Resolution: 0.01; 0.1 mg/L; 0.1°C

• Calibration: 2-point

• Display: LCD

• Electrodes: STDO11 (Optional); STTEMP30 (Optional)

• Temperature Compensation: Automatic (30 KΩ NTC Sensor)

• Power Supply: 4 × AAA (LR03) Batteries (Included)

• Battery Life: 250 hours

• Net Weight: 0.35 lb (0.16 kg)

• Dimensions (L × H × W): 6.69 × 1.38 × 3.54 in (170 × 35 × 90 mm)

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

• Measured Parameter: Dissolved Oxygen / Temperature

Applications

The Ohaus ST300D-B is ideal for aquaculture monitoring, environmental fieldwork, laboratory water analysis, and educational experiments. Because it is lightweight and battery-powered, it enables accurate dissolved oxygen measurements anywhere, ensuring reliable data for research or process control. Furthermore, its automatic temperature compensation and two-point calibration simplify operation, reducing potential user errors.