|Item Weight||7.2 ounces|
|Product Dimensions||0.8 x 3.9 x 4.3 inches|
|Item model number||445703|
|Batteries||1 AAA batteries required. (included)|
|Item Package Quantity||1|
|Number Of Pieces||1|
|Warranty Description||1 Year|
|National Stock Number||6685-01-588-4791|
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Extech 445703 Big Digit Hygro-Thermometer with Min/Max
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From the Manufacturer
- Extech 445703 Big Digit Hygro-Thermometer
- Built-in Tilt Stand
- Wall Mounting Bracket
- 1.5V AAA Battery
The Extech Big Digit Hygro-Thermometer provides easy to read, simultaneous measurements of humidity and temperature. With an accuracy of ±5%RH and ±1.8°F/±1°C, the 445703 helps maintain proper temperature and humidity conditions in factories, greenhouses, offices and other temperature and/or humidity sensitive environments.
Featuring big 1 inch digits on a super large LCD screen, this humidity temperature indicator can be wall mounted or placed on a desk using the built-in stand for convenient viewing. The internal memory stores record extremes, and comes with a reset function.
Combined Thermometer and Hygrometer Measurements
Easy to Read Display
1-inch Digits displayed on super large LCD (3.1 x 2.4-inch/80 x 62 millimeter) provide simultaneous measurements of humidity and temperature.
Memory with reset function stores maximum and minimum measurements.
The 445703 has a basic accuracy of ±5%RH and ±1.8°F/±1°C.
Easy to Use in Any Environment
Unit can be wall-mounted (mounting bracket included) or placed on a flat surface using the built-in tilt stand.
Switchable Temperature Measurements
Quickly switch between F/°C measurements.
Battery Powered Convenience
1.5V AAA battery included, plus low battery indication.
A humidity temperature indicator is essential for factories that specialize in food processing, electronic assembly, manufacturing wooden musical instruments, and many others.
Home & Office
Top Customer Reviews
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.
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.
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.
Our thermostat, tube thermometer and a different digital thermometer all read the same when placed in the same area. If I put this thermometer next to them it reads about 4 degrees warmer. Inside the package it says sender is responsible for shipping charges if returning the unit under warranty.
Update: December 30, 2011
I got a replacement unit through Amazon shortly after writing my first review. The replacement unit reads the same as my other thermometers and has been working perfectly ever since. First unit was just a lemon. So I'm bumping my review up to 4 stars.
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.Read more ›
Most Recent Customer Reviews
Last summer I worked in an overly hot office building. Building management was fighting me about our office temperature saying there was no actual problem. Read morePublished 8 days ago by Amazon Customer
I keep this on the wall of my music room. The guitars and other wooden instruments are very sensitive to humidity and this unit, with its very large display, can be seen across the... Read morePublished 10 days ago by Jay Keller
Very nice instrument. Seems to work great so far. Temperature and Humidity change as conditions change. Read morePublished 11 days ago by Amazon Customer
Brother-in-law was most satisfied with it for xmas. He's also a techy kind of person and he's familiar with his gift and what it can do.Published 16 days ago by Daniel J. Davis
One of the best and most accurate thermometer/hygrometer I have ever used.Published 17 days ago by newenglander1
I've purchased a bunch of these to monitor temp/humidity around the house and at work. Temp seems accurate - they are all within 1 degree of each other, and my house thermostat. Read morePublished 27 days ago by AmaJohn
This is worth the money, I bought it to monitor humidity of my home because we are installing hardwood flooring and because I am a nerd like that. Read morePublished 1 month ago by John Menard
Have not given it the salt test yet to check calibration, but has functioned perfectly for a month in my music studio. Read morePublished 1 month ago by Beejer
I got this so I can keep track of the humidity in my home. I. Checked this against the temperature of my home thermostat and it reads the same. Pleased with the accuracy. Read morePublished 2 months ago by Amazon Customer