How to Calibrate US211M/Lite?

Enter the reference K value (provided by the manufacturer), 

Measure the total amount of water in one minute, weigh it with a measuring tool, 

OR

Fill up a mineral water bottle, 

then compare it with the displayed value.

If the accuracy cannot meet the requirements,

Use the following formula to calculate the new K value:

Reference K value X flow display value ÷ actual weighing value (volume of mineral water bottle) = new K value. 

Enter the new K value and repeat the above calibration steps again.

Generally, it is very accurate after two times calibrations.