Starter 300 Ohaus ST300D DO Meter

Starter 300 Ohaus ST300D DO Meter

The Starter 300 Ohaus ST300D DO Meter is a compact, portable, and highly accurate instrument designed for measuring dissolved oxygen (DO) and temperature in a wide range of applications. Ideal for environmental testing, water-quality analysis, aquaculture, and education, this device combines advanced functionality with the simplicity of handheld operation, ensuring reliable performance in both laboratory and field environments.

Key Features

The ST300D provides a comprehensive measurement range of 0.00–19.99 mg/L, 0–400% saturation, and 0°C–50°C, allowing precise oxygen monitoring in various sample types and conditions. Its high accuracy of ±1% or ±0.3 mg/L for DO and ±0.3°C for temperature guarantees dependable readings for critical analyses such as aquatic research or wastewater treatment.

This model includes two high-quality probes — the STDO11 dissolved oxygen electrode and the STTEMP30 temperature probe — ensuring fast stabilization, accurate readings, and consistent performance across multiple samples. In addition, its LCD display clearly presents readings in different units (mg/L, ppm, or % saturation), making it easy for users to interpret results quickly.

The two-point calibration system improves measurement precision and allows easy recalibration for different sample environments. Moreover, the automatic temperature compensation (ATC) feature ensures accuracy under varying thermal conditions, eliminating the need for manual corrections. Because it is powered by four AAA (LR03) batteries, the ST300D delivers up to 250 hours of continuous operation, making it highly efficient for long-term fieldwork.

Technical Specifications

• Model: Ohaus Starter 300D (ST300D) 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: 0.1%; 1%; 0.1 mg/L; 0.1°C

• Calibration: 2-point

• Display: LCD

• Electrodes: STDO11 (DO sensor, Included); STTEMP30 (Temperature probe, Included)

• 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 Dissolved Oxygen Meter is suitable for environmental monitoring, water-quality control, fishery management, wastewater treatment, and academic research. Because it provides reliable readings of oxygen concentration, it helps researchers and technicians assess water health, detect contamination, and monitor aquatic life support systems effectively.

Its portable and lightweight design makes it convenient for both indoor and outdoor testing. Furthermore, the automatic temperature compensation ensures precise results regardless of environmental variations, while the two-point calibration enhances measurement confidence in professional applications.