Vaisala HM41 [HM40A2AB] Humidity and Temperature Meter w/ NiMH Rechargeable Batteries

HM40 Humidity and Temperature Meter for HVAC, 1.5%RH accuracy
The Vaisala HM40 is the functional replacement for the popular HM34 and HMI41. It features better accuracy, a large display and reading stabilization indication at a similar price level.  A variety of probe options are available for most applications.

Vaisala HM40 HUMICAP® Hand-Held Humidity and Temperature Meter is compact, robust and affordable. It is a perfect spot-checking tool that is easy to use and provides reliable measurements. It can be used for different portable measurement applications. Basic and simple to utilize, the HM40 includes a user-friendly, large graphic display and easy-to-use push button interface. The multilingual user interface with 10 different languages, is simple and intuitive to use.   Additionally numerous different settings can be programmed by the user to best suit their individual requirements. In addition to relative humidity and temperature, the HM40 provides 5 calculated humidity quantities. 

The HM40 is easy to use, robust and provides a repeatable humidity measurements. The stabilization graph clearly indicates when the readings have stabilized. All readings are available in both metric and non-metric units, much improved over the outdated HM34 series. The meter is powered by 2 AA-sized batteries. An external NiMH battery recharger with USB connection and rechargeable NiMH batteries are available as options. Each HM40 comes also with a handy belt clip.  The HM40 is available with an optional calibration certificate.