Ohaus ST400D Portable Dissolved Oxygen Meter The ST400D is a practical, affordable, and low maintenance DO portable meter. It is equipped with optical technology which is ideal for applications that require simple yet accurate DO measurements. The optical probe requires minimal maintenance. Frequent membrane replacement, and warming up and stirring of samples when taking measurements, are not required. The meter is equipped with a colour LCD display and is designed to fit comfortably in the palm of your hands. The automatic/manual endpoints enable easy recall of last calibration data and stored information with one touch. The simple calibration process offers quick delivery of measurements and automatic temperature and barometric pressure compensation ensure accurate results. Packages - Available in three configurations: ST400D-B ST400D ST400D-G 400D Meter with IP54 sets Electrode Clip Wrist Strap 4 AAA Batteries Probe Not Included 400D Meter with IP54 sets Electrode Clip Wrist Strap 4 AAA Batteries STDO21 Probe 400D Meter with IP54 sets Electrode Clip Wrist Strap 4 AAA Batteries STDO21 Probe Portable Bag Specifications: Measurement Range: 00 – 20.0 mg/L(ppm); 0 – 50°C Measurement Resolution: 01 mg/L; 0.1%; 0.1 °C Accuracy ±: ±0.2 mg/L(< 8 mg/L) or ±0.3 mg/L(8~20 mg/L); ±0.3 °C Display: Colour LCD Graphics Probe: STDO21 (Not included in ST400D-B) Accuracy DO: 2 ppm Accuracy ± (Temperature): 3 °C Battery Life: 12 hours with Disposable Batteries Calibration: 2-point Dimensions: 91 in x 1.38 in x 3.54 in (150 mm x 35 mm x 90 mm) (LxHxW) In-Use Cover: No Measurement Range DO: 0 ppm; 20 pp, Measurement Range (Temperature): 0 °C ; 50 °C Net Weight: 35 lb (0.16 kg) Parameter: Dissolved Oxygen Power: 4 AAA (LR03) Batteries (Included) Resolution (DO): 01 Temperature Compensation: Automatic Temperature Resolution: 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) ST400D Compatible Probe: Optical DOP Probe – STDO21 Starter Series Data Sheet ST400D Manual