
SET key: Short press to switch on/off/long press to enter the setting mode
CAL/ESC key: long press in measurement mode to enter calibration mode / short press in setting mode to exit setting mode
Recall key: short press to turn on or off the backlight / long press to view the saved data, press the up and down keys to view the recorded data one by one, press the ESC key to exit the record viewing mode.
Mode/▲ key: increase value/switch mode
Save/▼ key: Short press to decrease value/switch mode/measurement mode to save data manually (up to 99 items)
Enter key: confirmation key
Put the measuring rod head to the depth of the water layer to be measured (the measuring rod head cannot touch the bottom of the pool), and keep swinging the measuring rod back and forth or left and right (if you do not swing the measuring rod, the measured value will continue to drop, lower than the actual dissolved oxygen value), after 1 to 3 minutes, the temperature of the measuring rod and the temperature of the water layer to be measured reach equilibrium, and the measurement data can be recorded. For seawater occasions or plateau areas, salinity .