Economical Portable Dissolved Oxygen Meter DO-P820 / DO-P821

Portable dissolved oxygen tester intended above all for experimental research. Measurement accuracy is 0.2 or 0.5 mg/L depending on the model, with automatic temperature compensation to limit error. The DO-P820 is less expensive and less accurate than the DO-P821, making it suitable for aquaculture. The DO-P821 offers higher accuracy, stores 500 sets of data and adds limit value protection, with an alarm when the high and low limits are exceeded. Features: Automatic temperature compensation ensures accurate measurements over the full range. Automatic endpoint lock retains stable readings for easy viewing and recording. 1- or 2-point calibration, using air-saturated water or zero-oxygen solution. Salinity and atmospheric pressure compensation eliminates measurement errors. USB interface for easy data transfer. High-quality electrochemical sensor: ideal for experimental research, teaching, aquaculture, swimming pools and more.