Certified salts
The HMK15 can be ordered with
certifi ed and pre-measured salts.
A sample calibration is made from
each batch in Vaisala’s Measurement
Standards Laboratory (MSL).

Calibrated thermometer
The HMK15 can be ordered with
a thermometer, which is used for
measuring the temperature during
the calibration. It can also be used
for checking the temperature
measurement accuracy of the
transmitter.