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

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HM40 Humidity and Temperature Meter for HVAC, with Remote Probe, 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. Remote probe design along with spiral cable makes it easier to measure and check readings in hard to reach places.

In addition to relative humidity and temperature, the HM40 provides 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 HMI40 Humidity and Temperature Meter.

The package includes:

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

See all HM40 series models.

Watch the video about Vaisala's HM40 series meters:

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

Part no. HM45

Quantity Price
500 € + VAT

Detailed information

Measurement parameter(s)Relative humidity
Absolute humidity*
Dew point temperature*
Mixing ratio*
Wet bulb*
Measurement range0 ... 100 % RH
-40 ... +60 °C (-40 ... +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 temperatureFor probe -40 ... +60 °C (-40 ... +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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