The HM40 is an ideal everyday spot-checking tool for HVAC professionals. The proven Vaisala HUMICAP® 180R sensor provides reliable measurement while the user interface with graphical trend display makes daily operation quick and easy. User interface is available in 10 languages.
In addition to relative humidity and temperature, the HM40 can display five calculated humidity parameters (absolute humidity, dew point, enthalpy, mixing ratio, wet bulb), all available in both metric and non-metric units. The HM40 features an interchangeable HMP113 measurement probe allowing for easy calibration (only the probe needs to be calibrated) or replacement of the probe.
The HM40 replaces the HM34 hand-held humidity meter.