Description

DO-P820/821 are one of the most popular portable DO meters. The DO-P820 dissolved oxygen meter is less expensive and less accurate than the P821, making it suitable for use in aquaculture.
The P821 not only has high accuracy and supports storage of 500 sets of data but also has added limit value protection. Exceeding the high and low limit values will be alarmed to remind. If there are other concerns besides the above differences when purchasing a dissolved oxygen meter, you can choose the affordable P820.

Portable Dissolved Oxygen Meter Specifications:
Model DO-P820 DO-P821
DO Range 0.00~20.00mg/L, 0.0~200.0% saturation 0.00~20.00mg/L, 0.0~200.0% saturation
Resolution 0.01mg/L, 0.1% 0.01mg/L, 0.1%
Accuracy ±0.5mg/L,±20% ±0.2mgL,±2.0%
Other Specifications Calibration Points 1 or 2 points 1 or 2 points
Temperature Compensation 0~50°C/32~122°F, automatic 0~50°C/32~122°F, automatic
Barometric Pressure Correction 60.0~112.5kPa/450~850mmHg, manual 60.0~112.5kPa/450~850mmHg, manual
Salinity Correction 0.0~50.0g/L, manual 0.0~50.0g/L, manual
Stability Criteria – Low or high
Calibration Due Alarm – 1 to 31 days or off
Hold Function Manual a auto endpoint Manual or auto-endpoint
Auto-Off 30 minutes after last key pressed 10,20 or 30 minutes after last key pressed
Memory 100 data sets 500 data sets
Communication Interface USB USB
Connector 6-pin mini-DIN 6-pin mini-DIN
Display Custom LCD (80×60mm) Custom LCD (80×60mm)
Power Requirements 3×1.5V AA batteries or DC5V power adapter 3×1.5V AA batteries or DC5V power adapter
Sizes(W×D×H) 170×85×30
Shipping Size (W×D×H)(mm) 350x100x300
N.W./G.W. (kg) 0.3/1.5

Portable Dissolved Oxygen Meter Features:
The following are the common features of the two:
Automatic temperature compensation to ensure accurate measurements over the full range.
Automatic endpoint lock, retains stable readings for easy viewing and recording.
1or 2 point calibration, using air-saturated water or zero-oxygen solution.
Salinity and atmospheric pressure compensation to eliminate measurement errors.
USB interface for easy data transfer