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Extech 445715 Big Digit Hygro-Thermometer

4.3 out of 5 stars 271 customer reviews
| 42 answered questions

List Price: $55.99
Price: $50.21 & FREE Shipping. Details
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In Stock.
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With Remote Probe
Standard
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  • Product color is very dark green and white
  • Humidity: 10 to 99% RH
  • Temperature: 14 to 140°F (-10 to 60°C)
  • Accuracy: ±4%RH; ±1°C/1.8°F
  • Max/Min with reset function
  • Complete with built-in stand, mounting bracket, sensor, and 1 AAA battery; optional calibration salt bottles
22 new from $50.21 4 used from $32.29

Scotts
$50.21 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Extech 445715 Big Digit Hygro-Thermometer
  • +
  • Boveda One-Step Hygrometer Calibration Kit - 75% RH - Standard Small
Total price: $58.16
Buy the selected items together

Special Offers and Product Promotions

Style: With Remote Probe | Configuration: Standard

Technical Details

Style: With Remote Probe | Configuration: Standard
  • Portable

Product Description

Style: With Remote Probe | Configuration: Standard

Designed to monitor relative humidity, and temperature. Features include a super large display, C/F switchable, Min/Max with reset function, low battery indication and a built-in stand for sitting on a desk and hardware for mounting on a wall. What's Included: mounting bracket and one AAA battery. 1 inch Digits on super large LCD Max/Min with ''reset'' function RH accuracy: ±5%RH Temperature accuracy: ±1.8°F, (±1°C) Temperature range: 14 to 140°F (-10 to 60°C) Humidity range: 10 to 99% RH Rear calibration adjustment pot

Product Information

Style:With Remote Probe  |  Configuration:Standard

Technical Details

Part Number 445715
Item Weight 6.4 ounces
Product Dimensions 3.9 x 0.8 x 4.3 inches
Item model number 445715
Batteries 1 AAA batteries required. (included)
Color Product color: Very Dark Green
Style With Remote Probe
Item Package Quantity 1
Number Of Pieces 1
Special Features Portable
Batteries Included? Yes
Batteries Required? Yes
Warranty Description 1 Year

Additional Information

ASIN B000NI4AQY
Customer Reviews
4.3 out of 5 stars 271 customer reviews

4.3 out of 5 stars
Best Sellers Rank #43,585 in Home Improvements (See top 100)
#19 in Home Improvement > Appliances > Large Appliance Accessories > Humidifier Parts & Accessories > Humidity Meters
#113 in Industrial & Scientific > Professional Medical Supplies > Diagnostics & Screening > Thermometers
#379 in Patio, Lawn & Garden > Gardening > Indoor Gardening & Hydroponics
Shipping Weight 6.4 ounces (View shipping rates and policies)
Date First Available September 1, 2004

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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From the Manufacturer

Factories and Warehouses

Many factories and warehouses rely on ideal levels of temperature and humidity, especially when working with wood. Manufacturers, distributors or retailers of wood floors and wooden musical instruments should use a hygro-thermometer to prevent damage to inventory.

Factories and Warehouses

Wet Paint and Other Coatings

Document Storage

Food Processing


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Afia TOP 500 REVIEWERVINE VOICE on December 28, 2012
Style Name: With Remote ProbeConfiguration: Standard Verified Purchase
This is the most inexpensive device of its kind on Amazon - a guaranteed accurate hygro-thermometer. The outside sensor in the product photo is attached to a small cylinder-shaped arm affixed to the side of the unit.

All the twenty dollar type units that provide temperature and humidity levels will generally be in the correct range yet not with precision. Notice how the diligent reviewers of those cheap units cite comparisons with various hygro-thermometers to each other. In those citations, cheap units don't agree and it's impossible to know which is more correct.

Better to get one accurate unit and if needed, compare the others against it. This unit is accurate - guaranteed per the product description. The sensor is always on the outside of highly accurate units, and normally such units cost even more than this one.

My experience with this unit is positive. It's more accurate than the temperature gauges in my house that control heating and cooling, for example. I don't bother with other humidity reporting units because cheaper ones are notoriously inaccurate.

Extech makes many high-tech measuring devices, especially multimeters. The company is well-known to house inspectors and electricians.
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Style Name: StandardConfiguration: Standard
I bought this as a test for my wifes Bikram Hot Yoga studio. 90 minutes in a 105F room at 40% humidity. I already have several other very expensive instruments in the room. I needed 6 of these to place around the room for the students to see. I watched this unit compared to the other units in the room. It was always within 4 tenths of a point on the temp and humidity of the other units. It is very precise. In addition to that even I can read it from 15 to 20 feet away. Understand, ExTech makes some very high end expensive instruments, they are a very technically sophisticated company. I will now go ahead and order 5 more of these units. I am very pleased with the results. A great price for a very sensitive instrument.
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Style Name: With Remote ProbeConfiguration: Standard Verified Purchase
This was extremely accurate out of the box. The temperature was accurate to .1 degree, with reference to a high end Netatmo unit. The humidity was off by 4%, which is within the mfg. specs. I was able to calibrate it to 100% accuracy using a Boveda One Step Kit.

The surprising thing is how responsive this thing is. Just getting near it will change the readings, virtually instantly, no lag time. I think the fact this has an exterior sensor makes it far more responsive than one which is built into the unit, which many are.

A note on the picture. It looks much larger than it is, which is 4.25"x4", I wanted to show detail so I got in close.
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Style Name: StandardConfiguration: Standard
Extech makes multimeters and other high-tech devices. They have tons of products and this one isn't even on their website.

But just check out their hygro-thermometer that costs about 3 more bucks than this one: Extech 445715 Big Digit Hygro-Thermometer.

If you compare, you'll see this guarantee under the product description of the one I linked:
"Accuracy: ±4%RH; ±1C/1.8F. Optional NIST traceable certificate satisfies ISO and. other regulatory body requirements for product accuracy. traceability to nationally recognized reference standards."

The difference is the humidity sensor is outside the unit. All the devices with it inside the unit will be less accurate than if it was outside the unit. Therefore, I recommend that if you're thinking of getting Extech, go with the one linked above. Also, Extech is way better than the twenty dollar unit manufacturers.

I purchased and use the product I linked above. See my Amazon Verified Purchase there.
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Style Name: StandardConfiguration: Standard Verified Purchase
After reading a lot of positive reviews for this Extech 445703 Hygro-Thermometer unit, I decided to order this rather pricy model so I could get the best accuracy for my heated well house application (especially with a focus on the relative humidity sensing aspect). I received this yesterday, set it up, and then decided to initially check its performance and relative accuracy against some of the other temperature and relative humidity devices I already have at my home. These include a Davis Vantage Pro weather station, two Davis Vantage Pro consoles, two Davis Weather Echo Plus units, and a Honeywell Vision Pro 8000 unit with dehumidification control.

The Extech unit read 22% RH on start up and it just stayed there while the temperature reading did change as it equilibrated to the interior temperature of my home. I then started moving the Extech unit around to the other locations as my other instruments. Within approximately 15 minutes, the Extech unit temperature reading was essentially the same as the other devices (typically within a few tenths of a degree). However, while RH ranged from 15% to 16% with my other devices, the Extech unit continued to read 22% RH. After fooling around for a couple more hours with no better results, I decided to reset and clear the Min/Max memories to see if that would do anything. Unfortunately, the RH reading went back to 22% and stayed there.

This morning I decided to move the Extech unit into our master bath room where after two steamy hot showers, the unit still read 22% RH, where I am sure the RH must have been 100% or pretty close to it.

At this point, I am going to contact Amazon to replace this obviously defective unit. If the next one acts the same way, I will request a refund and get a different brand/model.
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