Frequently Asked Questions

How Do I calibrate the RH/Humidity for my WM-5?

First, locate the calibration sticker that was supplied with your WM-5. It will have two numbers displayed. You will need to calibrate your unit to these numbers. With the unit on, press and hold the on/off button for 10 seconds. The display will turn off and then back on, displaying the number 700.

Enter the first voltage input number into this screen by pressing the mode button to scroll up (omitting the decimal). Note: When in humidity calibration mode, the mode button only scrolls up, not down, so it is important that you do not miss the number you are entering. When finished, press the on/off button again, you will see the number 3000 

Enter the second voltage input number  using the same procedure as before. To store the changes, press the on/off button. The unit will then shut off with the new values stored internally. NOTE: Each unit has unique voltage input numbers. It is crucial that you do not lose your instrument’s numbers.

If you lose the voltage input number you can enter these values.

0%=0.780

75.3%=3.041