Vaisala HM40 Series [HM41] Humidity and Temperature Meter 14 to 140°F (-10 to 60°C)

HM40 Humidity and Temperature Meter for HVAC, 1.5%RH accuracy.
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. Replaces the popular HM34 and HMI41 Humidity and Temperature Meters.