Vaisala HM40 Series Pocket Size Thermohygrometers

Lightweight, pocket-sized meter with superior accuracy
  • Larger graphic display that shows when the measurement is stabilized
  • Provides 6 calculated measurements: RH, Temperature, Td, Tw, a x, h
  • Multilingual user interface with 10 language options
  • Easy-to-use menu
  • Replaceable probe
The Vaisala HM40 series hand-held meter is a compact and portable humidity meter that
provides reliable measurements in a wide range of applications. It is the ideal spot-checking tool for everything from structural moisture measurement and air conditioning systems to humidity measurement in industrial production processes and life science applications. There are four different models available: HM41, HM42, HM45, and HM46.

HM40 incorporates Vaisala HUMICAP® sensor that provides high accuracy, excellent long term stability, negligible hysteresis, and insensitivity to dust and most chemicals. The meter also features a hold button that retains the measurement data until it has been recorded, and automatic shut off.

The HM40 has a large, user-friendly graphical display and easy-to-use push buttons. The user interface is simple and intuitive, and available in 10 languages. Also, many settings can be modified to meet users’ individual needs. In addition to relative humidity and temperature, the HM40 provides five calculated humidity parameters, all of which are available in metric and non-metric units. The HM40 is powered by 2 AA batteries or rechargeable AA sized NiMH
batteries. Each model also comes with a handy belt clip and case.

£626.37 - £987.28GBP / Each
£751.64 - £1,184.74GBP (incl VAT)

4 variations of this product are available.

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Battery Max RH Range (%) Max Temperature (° F)
Availability Pricing
Vaisala HM40-A1AB Thermohygrometer with Intergraded Probe WZ-37801-10 Mfr # HM41
2 AA (included) 100 140
£626.37GBP / Each
£751.64GBP (incl VAT)
Vaisala HM40-A3AB Thermohygrometer; Integrated Probe with Nimh Batteries/Charger WZ-37801-11 Mfr # HM40-A3AB
1 Rechargeable NiMH (included) 100 140
£675.91GBP / Each
£811.09GBP (incl VAT)
Vaisala HM40-A3AB Thermohygrometer; Remote Probe WZ-37801-13 Mfr # HM45
1 Rechargeable NiMH (included) 100 140
£987.28GBP / Each
£1,184.74GBP (incl VAT)
Vaisala HM40-A3AB Thermohygrometer; Remote Probe with Nimh Batteries/Charger WZ-37801-14 Mfr # HM40-B3AB
1 Rechargeable NiMH (included) 100 140
£813.19GBP / Each
£975.83GBP (incl VAT)
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