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Chuck
Reviewed in the United States on March 1, 2025
The Extech 445715 Digital Thermometer is a solid purchase if you need accuracy. I use it for everything from cooking to checking room temperatures, and it’s always spot-on. The display is clear, and the device itself feels well-made and durable. It’s quick to respond, and the easy-to-use buttons make it simple to operate. If you need a reliable thermometer, this one’s definitely worth it!
YUSUF
Reviewed in the United Arab Emirates on May 14, 2024
Genuine product and good price.
Dean
Reviewed in the United States on October 4, 2024
Works well. Does not have an external probe.
J. Morin
Reviewed in the United States on January 23, 2024
Have had my Extech 445815 for 15 years. Temperature was accurate. RH was OK and sensitive. This winter my Extech RH readings were way off, so I decided to calibrate RH. As an engineer, I am familiar with using saturated salt solutions to calibrate instruments.Unfortunately, as others have discovered and commented on, and despite Extech's claims to the contrary, the RH adjustment did nothing. My own pure sodium chloride saturated salt test gave a meter reading of 59% RH at 70 degrees F - way off. I turned the humidity adjustment screw. No change in RH reading. The screw just turned and clicked every so often. No difference which way turned.Extech sells a very expensive humidity calibration kit, but if you cannot actually adjust the calibration then that kit is not worth the price. It will only tell you if your meter is close or completely off. Despite Extech's claims otherwise, you can do your own testing easily and cheaply as there are well researched and standardized test values available for using different saturated salts with RH values at various ambient temperatures.My conclusions: I enjoyed having this meter for many years. Loved having Dew Point as that is much more valuable than RH. Was looking forward to more years with a calibration. However, RH calibration screw just turns and does nothing.I will not buy an Extech replacement. I don't know, but perhaps their NIST certified models have RH calibration potentiometers that work. Extech's written product statement about ability to adjust the 445815 RH calibration is clearly wrong. Three stars as I did get years of use, but expensive for just a temperature-relative humidity meter.
Jon
Reviewed in Germany on May 12, 2021
This is a very good instrument displaying exactly what is relevant: Relative humidity, temperature and dewpoint. The dewpoint calculated from the other two is very useful to know but most other instruments show the time instead and who wants that on an instrument like this? The alarm functions and the max high and low recordings are useful as well. Designed by a respected instrument manufacturer by engineers with a vision.I lost my old one and had to find an exact match since nothing else could serve my needs any better.
Customer
Reviewed in Canada on May 19, 2017
Instructions for the product are not available in English nor in French. Only in "Chinese" Not really useful.
User2345
Reviewed in Canada on January 14, 2017
- Calibrated using Boveda- Well-built and BIG digital display...readings can be seen clearly from far away!- ACCURATE and FAST response time, almost INSTANT actually!- TEMPERATURE & RH% readings are very useful in any environment, but it does DEW Point readings as well...which is a BIG plus!- Probe can be detached to take readings behind walls if necessary, which is super convenient & handy- MIN & MAX can be reset, but can also be used to trigger a beeping ALARM which is more useful than it seems- This product only PROVES that EXTECH's already excellent reputation in this industry is WELL-DESERVED and 100% JUSTIFIED- Cheap analog meters do not guarantee fast, accurate & reliable readings...so stop wasting your time and invest in a good HIGH-QUALITY tool like THIS one and say bye bye to those analog meters for good!
Mark
Reviewed in the United States on October 26, 2016
I bought this to more accurately measure humidity levels inside the house. The manufacturer rates the humidity accuracy at +/- 4%. Most products at this price point or less don't specify the accuracy at all for humidity. The external sensor is extremely sensitive to humidity changes. I have not verified the accuracy of the readings as of yet but may do so in the future. Also, there is a calibration adjustment on the back so you can dial it in if need be, but I believe they are tuned at the factory so its really not necessary. The min max feature is nice to get a snap shot of how much temperature and humidity varies overnight or a longer period of time. This is probably one of the best I've seen at this price point.
ramdane
Reviewed in Canada on January 14, 2016
perfect
John K
Reviewed in the United States on December 3, 2013
I just installed a whole house dehumidification system in my home and needed 2 hygrometers for the main floor and the basement. I wanted to buy an accurate unit with a large print digital display. Thus far, the temperature tracks right on target with my expensive furnace thermostat. I have nothing to check the accuracy of the humidity readings, but assuming they are fairly accurate, I was able to adjust my Aprilaire humidity setting to keep the humidity levels at ~ 50% in both locations. The unit has a fold up stand on the back of it so I did not choose to wall mount them. I placed one of them on a book case shelf in my great room and one on my office desk in the basement. I also like the mount of the sensor on the outside of the unit which produces a more accurate humidity reading. I have used the Extech units for 1 month, but I am extremely satisfied with their performance to-date. They are more expensive than many others, but always believe that most of the time you get what you pay for by spending a little more money. In this case, I am protecting my entire home against humidity damage and was willing to pay more for a quality product. As usual, Amazon's pricing was better than the competition for this product. I can't testify that there wasn't a better price out there, but the price was good and Amazon's excellent shipping policy for Prime customers made the decision easy.
Jhs
Reviewed in the United States on July 13, 2008
Dew point display was the feature that made me buy this product. It has worked well, has a long battery life, and is accurate. The dew point shows how much humidity I can safely add in the winter without condensation forming on the windows. It also indicates the efficiency of the air conditioner in the summer. "Delta T" (the change in temperature, the temperature of the intake air minus the temperature of the chilled air) shows how much heat the air conditioner is removing. Since the a/c also removes moisture, the dew point tends to be the same as the evaporator plates, which is the temperature of the chilled air. (Unless you live in a dry climate.) So, just noting the difference between the ambient air and dew point indicates the efficiency. It is amazing how much more efficient the a/c is in the morning, when the outside temperature is in the 70s versus how little chilling happens in the afternoon in the 90s. I quit running the a/c in the mid afternoon, and save a few buck on the electricity. It is a fine product. Spread the word about the dew point!
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