Ohaus Portable Meter ST400D-B; STDO21 Optical DO 30378543

The Ohaus Portable Meter ST400D-B (part #30378543) is a handheld dissolved oxygen (DO) meter with an optical STDO21 electrode designed for accurate measurement of dissolved oxygen levels in water samples.

Key Features:

• Measurement Range: 0.00 to 20.0 mg/L (ppm) dissolved oxygen; 0 to 50 °C temperature
• Measurement Resolution: 0.01 mg/L for DO; 0.1 °C for temperature; 0.1% DO saturation
• Accuracy DO: ±0.2 mg/L for DO below 8 mg/L; ±0.3 mg/L for 8-20 mg/L range
• Accuracy Temperature: ±0.3 °C
• Calibration: 2-point calibration
• Temperature Compensation: Automatic with manual salinity adjustment option
• Display: Large backlit color LCD graphics
• Electrode: STDO21 Optical DO probe included
• Battery Power: 4 AAA (LR03) batteries included; approximately 12 hours battery life
• Memory: Stores up to 99 measurements with last calibration recall
• Dimensions: 1.38 in (H) x 5.91 in (L) x 3.54 in (W) (35 mm x 150 mm x 90 mm)
• Weight: 0.35 lb (0.16 kg)
• Construction: Durable IP54 rated ABS housing with wrist strap and meter stand
• Operating Environment: 5 °C to 40 °C; 41°F to 104°F; 80% relative humidity, non-condensing

Advantages:

• Wide measurement range and high resolution allow for precise dissolved oxygen monitoring in diverse water conditions
• Accurate optical probe reduces maintenance and eliminates sample warm-up time, enabling immediate measurements
• Automatic temperature compensation improves measurement reliability across varying temperatures
• Stored 99 measurement memory with calibration recall facilitates efficient data management and repeatability
• Compact, lightweight, and rugged design with IP54 rating ensures durability and ease of use in field environments
• Backlit color LCD enhances readability in low-light or outdoor conditions
• Long battery life supports extended field use without frequent battery changes