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Extech 445713 Big Digit Indoor/Outdoor Hygro-Thermometer

3.9 out of 5 stars 42 customer reviews
| 12 answered questions
List Price: $45.99
Price: $37.93 & FREE Shipping on orders over $49. Details
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  • Simultaneous display of Indoor/Outdoor Temperature and Humidity
  • ax/Min with "reset" function
  • Humidity: 10 to 99% RH
  • Temperature: 14 to 140°F (-10 to 60°C)
  • Accuracy: ±5%RH; ±1.8°F, ±1°C
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Frequently Bought Together

  • Extech 445713 Big Digit Indoor/Outdoor Hygro-Thermometer
  • +
  • Extech 445703 Big Digit Hygro-Thermometer with Min/Max
  • +
  • AcuRite 00613 Indoor Humidity Monitor
Total price: $83.02
Buy the selected items together

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From the Manufacturer

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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

Gardens and Greenhouses

Food Processing

Technical Details

  • 1.5V AAA battery

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This item Extech 445713 Big Digit Indoor/Outdoor Hygro-Thermometer
Customer Rating 4 out of 5 stars (42) 4 out of 5 stars (11796) 4 out of 5 stars (294) 4 out of 5 stars (57)
Price $37.93 $9.10 $35.99 $11.99
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Sold By Amazon.com Amazon.com Amazon.com Ambient Weather
Color — Silver Green White
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Product Description

Extech 445713 Big Digit Indoor/Outdoor Hygro-Thermometer

Product Information

Technical Details

Technical Specification

Warranty [pdf ]

Additional Information

Warranty & Support

Product Warranty: For warranty information about this product, please click here [PDF ]

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Customer Reviews

Top Customer Reviews

2.0 out of 5 starsA very good product; however, there's a reliability problem--another unit failed!
By Clarence Threepwood on April 16, 2011
Verified Purchase
Update: February 9, 2015

Alas, another of these excellent units has bitten the dust. They simply don't last that long, even when the probe is protected from the elements. We originally bought two of them because they are designed so much better than other indoor-outdoor thermometers-humidity devices. And, for a couple of years, they worked liked a charm. However, like our first, our second unit's hygrometer has now failed--it reads 29% at all times. If you read the story at the end, you'll see that the first one failed last year, getting stuck at 15%. Very disappointing!

Plus, there's a problem reaching the company-- I detail that at the end, too.

ORIGINAL REVIEW

As you can tell from my other reviews, we've been on a quest for a decent, accurate, easy to read indoor-outdoor thermometer with hygrometer (humidity reader). Every one we've tried has failed in particularly fundamental ways--screen hard to read, digits too small, too much superfluous nonsense, inaccurate, etc.

Well, Extech has accomplished a minor miracle with this product.

1. Readable. You can see the digits from across the room.

2. Crisp display. They show up well even when the only light is in another room.

3. Accurate. The humidity and temperature readings are virtually identical when the probe sits by the base unit's air opening--off by only .1 or not at all--meaning the unit is incredibly accurate (finally we found one!).

4. Worry-free. There's no worrying about the batteries in an external unit.

5. Data-rich. Has min/max button.

6. Frustration-free. Battery compartment easy to open.Read more ›
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5.0 out of 5 starsGreat Experience With Extech
By Marcos C. Augusto on July 20, 2015
Verified Purchase
I purchased one of these about 1 1/2 years ago and about one month ago I noticed that the remote sensor probe was not displaying correct values for humidity level, so i contacted the manufacturer to inquire about buying just the probe and replace it myself, since it looked like it was simply attached to the cable by a tiny philips screw.
The representative at Customer Service that handled my request told me that although at the moment he did not have easy access to a replacement probe he would gladly send me a brand new Extech 335713 item free of charge, that the company stands fully behind all products it sells and that it takes care of all customers requests to the best of its ability, and that is exactly what I got !
I feel that Extech deserves to be mentioned here at Amazon.com for the way its representative handled my request which was above and beyond my expectations with apparently a single aim in mind : the best customer care at any cost.
Congratulations to Extech, and i wonder how would a competing company have handled my request ? It could not have topped my experience with Extech !
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2.0 out of 5 starsGood design, but not very accurate, and hygrometer broke after 8 months
By stlulu on June 1, 2011
Verified Purchase
Good points: This thermometer/hygrometer is compact and the numbers are easy to read.
Warning: It is very sensitive to temperature changes, so in our case, the external sensor was somewhat near a vent and the external temperature and humidity were always changing up and down quickly as the vent let steam out. It could react a bit slower to avoid inaccurate readings in cases like this (gusts, vents, etc.).
Problem: Unfortunately after some months it broke, past warranty which is 6 months according to the leaflet that came with it. The external hygrometer now displays levels such as 10% whereas it's actually around 50%.
I brought it inside and put the sensor tip right beside it. The internal and external numbers don't match. Comparing to an older Brookstone one that I have, the numbers are different by almost 10F, but I can't swear for either.
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3.0 out of 5 starsIt works BUT!!!
By William Statler on February 5, 2014
Verified Purchase
It seems to work OK.... BUT... The EXTREMELY SHORT lead on the outdoor sensor makes it very difficult to "install". The sensor needs to be located OUTSIDE (obviously) which means sticking it out through a window (two windows.. main and storm). This leaves precious little of the lead INDOORS so the display needs to be located virtually on the window sill... awkward at best.

I can't imagine that the cost of making the lead at least 6 feet long would raise any problems.... either cost or function... it's only a conductor after all... nothing high tech here.

Without this short coming I would give this 5 stars.
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5.0 out of 5 starsUseful tool and accurate
By Kwok on September 29, 2013
After I received it, the first thing I did was to do the salt water test for accuracy. (This model does not allow adjustment). Both humidity readings were within 1% of the 75% target. The temperature readings were within 0.1F of each other. After I took the device out of the salt water environment (plastic bag), the probe sensor changed quickly to the room humidity within minutes. The built-in sensor took a bit longer to stabilize. But after about 1 hour, they stabilized to within 2% of each other. This is well within their specs of +-5%. From what I can tell now, this is quality equipment for a very reasonable price. (I hope time will not change my opinion.) Unlike other models, this takes only 1 AA battery, and I don't know how long it will last.
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Most Recent Customer Reviews

4.0 out of 5 stars... bit off and the accuritcy may not be that great.

I cannot give this 5 stars because I feel the discription is a bit off and the accuritcy may not be that great.

Published 1 month ago by joleen
3.0 out of 5 starsI wouldn't but it again.

Like others have stated, the lead on the external sensor is too short. That leaves my outside temperature always wrong. Also, I cannot open that window because of the lead. Read more

Published 4 months ago by bigbrian
5.0 out of 5 starsTurtle Egg Incubation

I'm using this to monitor Wood Turtle eggs that were laid a couple weeks after I adopted a female.

Published 6 months ago by insculpta
5.0 out of 5 starsWorks great. Nice big numbers are easy to read at ...

Works great. Nice big numbers are easy to read at a distance.

Published 8 months ago by Eric A.
5.0 out of 5 starsFive Stars

Works great, easy to read, updates temps fast

Published 11 months ago by Brodie Dehass
4.0 out of 5 starsFour Stars

Performs as advertized

Published 11 months ago by iggy
3.0 out of 5 starsThree Stars

I wished the sensors cord was longer,

Published 12 months ago by cccarpet
5.0 out of 5 starsGood stuff at a fair price

Large digits, reasonably accurate, happy to have it. /wish it had a little larger of specification range: Perhaps -20 degrees to +125 degrees F.

Published 18 months ago by David H. Bernhauser
4.0 out of 5 starsNice accurate and very visible read out

Nice accurate and very visible read out.
I only wished the external sensor cable is longer than it is. Maybe 6 to 8 feet long. Read more

Published 18 months ago by gil gil
5.0 out of 5 starsWorks great. Outside unit not affected by severe storms

Love it. Previously had remote sensor units that always stopped working during periods of high humidity. This unit worked without fail during several severe storms. Read more

Published 19 months ago by Bob Little

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