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  • Extech 445703 Big Digit Hygro-Thermometer with Min/Max
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Extech 445703 Big Digit Hygro-Thermometer with Min/Max

by Extech
135 customer reviews
| 14 answered questions

List Price: $42.99
Price: $30.00 & FREE Shipping on orders over $35. Details
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Sold by Empire Depot and Fulfilled by Amazon. Gift-wrap available.
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  • 1 inch Digits on Super Large Dual Display
  • Min/Max with reset function
  • Humidity: 10 to 99%RH
  • Temperature: 14 to 140 degrees F (-10 to 60 degrees C)
  • Desktop or Wall Mount
See more product details
19 new from $30.00 2 used from $25.13
$30.00 & FREE Shipping on orders over $35. Details In Stock. Sold by Empire Depot and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

Extech 445703 Big Digit Hygro-Thermometer with Min/Max + AcuRite 00613A1 Indoor Humidity Monitor
Price for both: $39.98

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Product Description

Product Description

Extech 445703 Big Digit Hygro-Thermometer with Min/Max

Amazon.com

445703
Large 1-inch digits.

Ideal for maintaining proper temperature and humidity conditions in factories, greenhouses, and offices, the Extech 445703 Big Digit Hygro-Thermometer can also record extremes in temperature during the day. Featuring a dual display with large 1-inch digits, the 445703 provides simultaneous measurement readouts for humidity and temperature.

The 445703 includes a memory with reset function that stores both maximum and minimum measurements. It has a temperature range of 14 degrees to 140 degrees F, and a humidity range of 10 to 85 percent relative humidity (RH). This thermometer is accurate to 1.8 degrees F and 6 percent RH, and you can easily switch between Fahrenheit and Celsius. It's powered by a single AAA battery, and it includes a low battery indicator. The 445703 measures 4.3 x 3.9 x 0.78 inches (HxWxD), weighs 6 ounces, comes complete with a built-in tilt stand and a mounting bracket. It's backed by a one-year limited warranty.

What's in the Box

Extech 445703 Big Digit Hygro-Thermometer, wall-mounting bracket, one AAA battery, operating instructions

445703
Simultaneous display of temperature and relative humidity (view larger).
At a Glance
Extech 445703 Big Digit Hygro-Thermometer
At a Glance:
  • Simultaneous display of humidity and temperature

  • Large LCD (3.1 x 2.4 inches) with 1-inch digits

  • Memory stores maximum and minimum measurements

  • Built-in tilt stand, wall mountable

  • Powered by one AAA battery

  • One-year limited warranty
At a Glance

See all Product Description

Product Information

Technical Details
Part Number 445703
Item Weight7.2 ounces
Product Dimensions0.8 x 3.9 x 4.3 inches
Item model number445703
National Stock Number6685-01-588-4791
Batteries:1 AAA batteries required. (included)
Materialplastic
Item Package Quantity1
Number Of Pieces1
Batteries Included?Yes
Batteries Required?Yes
Warranty Description1 Year
  
Additional Information
ASINB00069ECFY
Best Sellers Rank #7,964 in Home Improvement (See top 100)
Shipping Weight7.2 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First AvailableSeptember 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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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

64 of 68 people found the following review helpful By 1212survivor on April 19, 2011
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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49 of 51 people found the following review helpful By Afia TOP 500 REVIEWERVINE VOICE on December 28, 2012
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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38 of 42 people found the following review helpful By vanhip on November 19, 2011
Verified Purchase
Shows about 4 degrees warmer than other thermometers in the house.
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.
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19 of 20 people found the following review helpful By nightskywatcher on November 30, 2012
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.
Read more ›
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11 of 12 people found the following review helpful By William J. Kastner on March 17, 2007
Verified Purchase
Very accurate keep it on the dresser in the bedroom to check the temperature and humidity in the house. very satisfied.
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7 of 7 people found the following review helpful By fastidious on January 28, 2011
Verified Purchase
ordered 2; already had 1 for several years. just for fun i set all 3 in same location to compare readings. they were all identical and changed to same reading as temp & humidity in room changed. i conclude that these are very accurate devices.
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5 of 5 people found the following review helpful By Dmitri on June 3, 2012
This device is very accurate. Probably first device in my hands able to measure humidity (+/-5%) for price undo $100. Long battery life. Keeps in memory minimum and maximum values for temperature as well as for humidity for measuring period - nice feature
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5 of 5 people found the following review helpful By Keval Nguyen on January 25, 2012
Verified Purchase
The size of the display is very functional. Very simple operation but does the job. This is my first Hygro-Thermometer and I like it a lot. I would recommend this for anyone looking for a simple temperature/humidity gauge.
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Extech 445703 Big Digit Hygro-Thermometer with Min/Max
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