• Humidity Range: 0 to 100%
  • Humidity Accuracy: ±5%
  • Temperature Range: 32 to 122°F
  • Temperature Accuracy: ±1.5°
  • Resolution: 0.1% RH / 0.1° F
  • Simultaneously displays Temperature (°C/°F) and Relative Humidity
  • Max/Min and Data Hold
  • Built-in self calibration utility allows for field calibrations using optional Relative Humidity calibration bottles

What's in the Box

  • Pocket clip
  • 3V lithium battery


The Extech 445580 humidity and temperature pen features a compact design that is ideal for field use. With a range of 0 to 100% and a basic accuracy of ±5% for humidity and temperature range of 32 to 122°F with an accuracy of ±1.5°, the Extech 445580 humidity and temperature pen can simultaneously display temperature (°C / °F) and relative humidity with a maximum resolution of 0.1% RH and 0.1°F.

Other features of the Extech 445580 humidity and temperature pen include MAX / MIN, data hold, and a built-in self calibration utility that allows for field calibrations. The self calibration requires the optional relative humidity bottles which are included in the 445582 kit.

In Stock

Manufacturer Stock

This stock is typically available to ship in 3 - 5 working days.

Part Number Price Available
$74.99 50 in stock

Interested in Other Part Numbers?

Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 3-5 business days". Click here to select options