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Vaisala HM45 Thermohygrometer; Remote Probe

Vaisala  |   Mfr# HM45   |   Item# DO-37801-13

$820.50 USD/EACH

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or call 1-888-358-4712 to order

  • 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.

What's Included:
batteries, probe, and NIST-traceable calibration report supplied by vendor.
Product Type Thermohygrometer
Temp range -10 to 60C (14 to 140F)
RH range (min) 0%
RH range (Max) 100%
RH range 0 to 100%
Max temperature (º C) 60
RH accuracy at 0 to 40C (32 to 104F) ±1.7 %RH (0 to 90 %RH) / at -10 to 0C and 40 to 60C (14 to 32F and 104 to 140F) ±3.0 %RH (0 to 90 %RH) ±4.0 %RH (90 to 100 %RH)
RH resolution 0.1%
Min temperature (º F) -10
Min temperature (º C) -10
Max temperature (º F) 140
Temp accuracy at 0 to 40C (32 to 104F) ± 0.2C (0.36F) / at -10 to 0C and 40 to 60C (14 to 32F and 104 to 140F) ±0.4C (0.72F)
Temp resolution 0.1°
Dimensions 230 x 72 x 44 mm
Response time 90% response time in 17 seconds
Output Displays: RH, T, Td, Tw, a x, h
CE Compliance Yes
Model HM40-A3AB
Qty/ea 1
Manufacturer number HM45
Brand Vaisala
Display LCD (140 x 160 pixels)
Power with battery charger and two rechargeable batteries (included)
Make HM40


at $387.30 USD/EACH

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Questions and Answers

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1 Question | 1 Answer
Displaying question 1
  • Q:

    Need to know dimension of prob - length and diameter.
    Asked on 2/19/2015 by Robert from United States

    1 answer



      The diameter of the probe is 12 mm with a length of 73.5 mm. The total length of the probe including the handle is 213 mm.

      Answered on 2/27/2015 by Polo from Technical Support
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