This Portable Dissolved Oxygen Meter is designed for outdoor
applications.
Simple on-site calibration requires no chemical solutions. Just
expose the probe to air and press the CAL button....
Traceable to NIST* standards
Large digits simultaneously display DO and temperature
DO range, 0.0 to 20.0mg/L, ±0.4mg/L
Temperature range, 0.0° to 60.0°C...