Ohaus ST400D Starter 400D DO Portable

The Ohaus ST400D is designed for dissolved oxygen testing in laboratories, environmental monitoring, aquaculture, wastewater treatment, food processing, and educational applications. Its portable waterproof design makes it suitable for both field and laboratory dissolved oxygen measurements.

The Ohaus ST400D measures dissolved oxygen from 0.00 to 20.0 mg/L (ppm) with a resolution of 0.01 mg/L. It offers an accuracy of ±0.2 mg/L below 8 mg/L and ±0.3 mg/L from 8 to 20 mg/L, helping provide reliable and repeatable water quality measurements.

The Ohaus ST400D includes the STDO21 optical dissolved oxygen probe, which uses optical measurement technology for low-maintenance operation and fast readings. Unlike traditional membrane-style probes, optical probes reduce warm-up time and minimize routine maintenance requirements.

The ST400D features a rugged IP54-rated housing, backlit color LCD display, wrist strap, lightweight portable design, and battery-powered operation for convenient field testing. Its optical probe technology also allows quick measurements without complicated sample preparation.

Yes. The Ohaus ST400D can store up to 99 measurement records for convenient recall and documentation. This built-in memory function helps laboratories and field technicians improve data organization and simplify routine dissolved oxygen monitoring workflows.