ST400D-B Starter 400D DO Portable Meter from Ohaus

Ohaus 30378541

For over a century, OHAUS has perfected the art of measurement through our line of weighing products. Taking the same approach to our weighing equipment, OHAUS now delivers Starter ST400D - a practical, affordable, low-maintenance DO Portable Meter equipped with optical technology. The ST400D is ideal for applications that require simple yet accurate DO measurements.


Field and lab Dissolved Oxygen measurement


Backlit Color Liquid Crystal Display (LCD)


4 AAA batteries (included)




ABS Housing

Design Features

99 measurement memory, last calibration data recall, auto barometric pressure measurement, auto temperature compensation with manual salinity compensation


Measurement Range: 0.00 – 20.0 mg/L(ppm); 0 – 50 °C, ±0.2 mg/L(< 8 mg/L) or ±0.3 mg/L(8~20 mg/L); ±0.3 °C

Measurement Resolution: 0.01 mg/L; 0.1 °C; 0.1%

Display: Color LCD Graphics

Electrode: STDO21 (Available as product)

Accuracy DO: 0.2 ppm

Accuracy ± (temperature): 0.3 °C

Battery Life: 12 hours with Disposable Batteries

Calibration: 2 Point

Dimensions (HxLxW): 1.38 in x 5.91 in x 3.54 in (35 mm x 150 mm x 90 mm)

In-use cover: No

Measurement Range DO: 0 ppm – 20 ppm

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

Net Weight: 0.35 lb (0.16 kg)

Parameter: Dissolved Oxygen

Power: 4 AAA (LR03) Batteries (Included)

Resolution (DO): 0.01

Temperature Compensation: Automatic

Temperature Resolution: 0.1 °C

Temperature Sensor: 10 KΩ NTC

Working Environment: 41°F – 104°F, 80%RH, non-condensing (5°C – 40°C, 80%RH, non-condensing)

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