The Vaisala HUMICAP® Hand-Held Humidity and Temperature 

Meter HM40 is a compact and portable humidity meter at hand 
everywhere you go. It is an ideal spot-checking tool that is easy 
to use and provides reliable measurement. It can be used for a 
wide range or various portable measurement applications.

Features

• Humidity measurement range 0...100 %RH
• Operating temperature range -10 °C...+60 °C
• Display a wide range of quantities: RH, T, Td, Tw, a, x, h
• Graphical display indicates when measurement has stabilized
• Compact and robust housing
• Hold-button to freeze the screen and save the reading
• Multilingual user interface with 10 languages
• The interchangeable measurement probe HMP113 can be 
  user calibrated
• Incorporates the proven Vaisala HUMICAP 180R® sensor