HM40 Humidity and Temperature Meter for HVAC, 1.5%RH accuracy - Vaisala Online Store

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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.

See all HM40 indicator products

The package includes:

  • HM40 humidity and temperature meter
  • Calibration certificate (ISO9001 compliant, traceable)
  • Light carrying case
  • Alkaline batteries 2 x AA sized, 1.5V (LR6)
  • User's Guide in English

HM40 Humidity and Temperature Meter for HVAC, 1.5%RH accuracy
The hand-held HM40 Hygrometer comes with calibration certificate
Standard delivery time for single unit: 1 week
About delivery times »
Warranty: 24 months
About warranty »

Part no. HM41

Quantity Price
411 € + VAT

Detailed information

Measurement parameter(s)Relative humidity
Absolute humidity*
Dew point temperature*
Mixing ratio*
Wet bulb*
Measurement range0 ... 100 % RH
-10 ... +60 °C (+14 ... +140 °F) T
Measurement accuracyAt temperature +0 ... 40 °C (+32 ... +104 °F):
±1.5 % RH (0 ... 90 % RH)
±2.5 % RH (90 ... 100 % RH)
±0.2 °C T
Operating temperature-10 ... +60 °C (+14 ... +140 °F) T
Operating voltage2xAA-size alkaline batteries, type IEC LR6
Housing classificationIP54
Links See full specifications on
Download user guides and other product documents on

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