Calibrating the HM40 Using HMK15 
The HMK15 Humidity calibrator allows you to produce 
known humidity environments using saturated salt 
solutions. 
 
Performing a good calibration takes some time 
and preparation. Read the HMK15 User’s Guide 
before performing your first calibration with the 
HMK15.  
 
1.  Press the Menu button and select 
the 
2. Select the parameter to be 
calibrated at menu item 
. You can calibrate 
Temperature (T) or Relative 
Humidity (RH) measurement. All 
other humidity parameters are 
calculated from RH and T, so they 
will also be adjusted.