Home » Home Improvement » Extech 445580 Humidity and Temperature Pen Sized Meter with Pocket Clip


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Extech 445580 Humidity and Temperature Pen Sized Meter with Pocket Clip


Extech 445580 Humidity and Temperature Pen Sized Meter with Pocket Clip

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Humidity/Temperature Pen

This compact, digital Hygro-Thermometer is ideal for field use. Comes with pocket clip, 3-volt lithium battery, and user guide.

Features Overview

This humidity/temperature pen features a dual LCD that can simultaneously display temperature from 14 to 122 degrees F (-10 to 50 degrees C) and humidity from 10 to 90 percent RH with accuracies of ±5 percent RH and ±1.8 degrees F (1 degree C).

Other Features

This pocket-size unit features a Max/Min memory function that stores highest and lowest readings for both temperature and relative humidity. Data Hold “freezes” the reading on the display for easy viewing, and Auto Off to conserve battery power.

RH300-CAL Option

A built-in self-calibration utility allows for field calibrations using the optional RH300-CAL calibration kit that includes two calibration bottles — one bottle uses Sodium Chloride (NaCl) to produce the 75 percent relative humidity reference, and the other uses magnesium chloride (MgCl) for the 33 percent relative humidity standard.

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  • Displays relative humidity from 10 to 90-percent and air temperature from 32 to 122 F (0 to 50 C) on dual display
  • Fits in shirt pocket and includes pocket clip
  • Min/Max and Data Hold
  • Simple operation
  • Auto power off increases battery life

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What customers say about Extech 445580 Humidity and Temperature Pen Sized Meter with Pocket Clip?

  1. 8 of 8 people found the following review helpful
    5.0 out of 5 stars
    Accurate and useful, March 30, 2012
    By 
    Geoff Sarkissian (Silverado, California) –

    Verified Purchase(What’s this?)
    This review is from: Extech 445580 Humidity and Temperature Pen Sized Meter with Pocket Clip (Tools & Home Improvement)
    Wanted a hygrometer that was accurate below 40% humidity. There are tons of cheap humidity meters on Amazon and EBAY some selling for $2 or less. They are completely inaccurate in dry weather. I live in a dry part of California and the humidity often drops below 20% and during a Santa Ana wind, can go to 5%. None of the cheap meters can measure dry air humidity, so don’t waste your money on them, if you really want to know what is the humidity on a dry day.

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  2. 2 of 2 people found the following review helpful
    5.0 out of 5 stars
    Use for work…, February 16, 2012
    By 

    Verified Purchase(What’s this?)
    This review is from: Extech 445580 Humidity and Temperature Pen Sized Meter with Pocket Clip (Tools & Home Improvement)
    This is the best priced place for this product… used for business. Dependable, easy to use. For the price, easy to provide one for each crew chief.

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  3. 1 of 1 people found the following review helpful
    3.0 out of 5 stars
    pretty good if you’re not an accuracy freak, May 18, 2015
    By 

    This review is from: Extech 445580 Humidity and Temperature Pen Sized Meter with Pocket Clip (Tools & Home Improvement)
    … pretty good if you’re not an accuracy freak. On two units, RH readings were always off … temperature readings were mostly accurate.

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