Vaisala Calibration of Digital Transmitters with HMI41 - Manual (Page 23)

Chapter 3 _______________________________________________________________ Calibration
VAISALA _______________________________________________________________________ 21
In this case, perform the calibration again. Whether the calibration
was successful or not, HMI41 always returns to show the selected
calibration mode:
RH
After having successfully completed the calibration, turn HMI41 off
and disconnect the cable.
HMI41 as a Terminal
HMI41 can also be used only as a terminal for visualizing and setting
the transmitter's RH reading (for example when the transmitter does
not have a local keypad and it is calibrated against salt solutions
without a personal computer).
RH
Insert the transmitter probe to the lower humidity. Within 1 ... 2
seconds the display will automatically change to show a text similar to
the following:
RH %
Numbers on the first line indicate the RH measured by the transmitter,
and numbers on the second line indicate the RH measured by the
HMI41 probe.