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Portable Humidity Meter

The new HM40 is a compact, robust and affordable hand-held meter for various portable measurement applications. It is an ideal spot-checking tool that is easy to use and provides reliable measurement. The HM40 hand-held utilizes the interchangeable HMP110 probe that was launched earlier this year and is equipped with the latest humidity sensor technology, the HUMICAP® 180R.

Technical Specs

Model HM40 (replacement of HM34C)
Fixed / Portable Portable
Measurement Range 0-100% rH
Accuracy ±2%rH
Remarks The main features and benefits of the HM40:
o Compact and robust housing
o Humidity measurement range 0…100 % RH
o Operating temperature range -10 °C…+60 °C
o Displays a wide range of quantities: RH, T, Td, Tw, a, x, h
o Interchangeable HMP110 probe with HUMICAP® 180R sensor
o Graphs for selected humidity quantity and temperature indicate when readings have stabilized
o Large graphic display
o Hold-button to freeze the screen
o Can be user calibrated
o Multilingual user interface with 10 languages: English, German, French, Finnish, Swedish, Chinese, Russian, Spanish, Japanese and Portuguese
o Powered by two standard AA-sized batteries
o Rechargeable AA-size NiMH batteries and an external battery recharger with USB connection available as an option

Data sheet

CatalogueProduct Selection Form

See also
Digital Humidity Module
The Vaisala HUMICAP® Digital Humidity Module HMM105 is an open frame module for integration into environmental chambers. The modules provide an I2C output
for relative humidity (RH) or dew point (.....
Assman Psychrometer
This is an aspirated type portable hygrometer for the accurate measurement of atmospheric humidity. It consists of two thermometers exposed side by side in a steady airflow produced by an attached as.....
Advanced portable humidity meter with remote probe
The new Vaisala HM70 portable humidity meter provides fast and convenient spot-checks of relative humidity and temperature. Apart from that, it can be also used to calibrate other Vaisala humidity .....


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