445713 Big Digit Indoor Outdoor Hygro-Thermometer - Large LCD, Temperature & Humidity Display, Min/Max Tracking, Comfort Level Icons, Wall or Desk Mount, Accurate Digital Sensor

It worked great for a year and then I experienced the previously reported problem with the outdoor humidity readings being way off (e.g. 12% when it was raining). I emailed Extech support and a few days later was sent a replacement unit (the whole thing, not just the external probe) at no cost. No hassles with proof of purchase or warranty dates. I would have rated this four stars due to the humidity sensor problem but Extech certainly earned five stars with their customer support. Update: The replacement unit appears to have a slightly different design to the external sensor internal components although the exterior shell is identical. So there's hope that the replacement units will not suffer the same demise as the originals.

The Extech 445713 Hygro-Thermometer served its purpose well during the time I used it. Its big digit display made indoor and outdoor temperature and humidity readings easy to understand. However, I can’t vouch for its absolute accuracy. Overall, it’s a decent product that met my needs until I no longer required it.

The main drawback (and benefit!) to this dual temperature/humidity instrument is that it uses a wire. There is no provision to be able to lengthen the wire if it is too short, and the remote probe is pretty fat so a large hole is required if you want to pass it through a wall. The wire is long enough to pass between most walls. That said, these Extech instruments are very accurate and are proven to last for many years. The instrument uses just one battery so there is no remote device battery to go dead and need to be replaced. I was concerned when I first unboxed and powered up the instrument since the in/out humidity was substantially different. After a few hours in the same location the temperature and humidity indication were within one count! I am using this instrument to measure the temperature/humidity in a garage, and an adjacent crawl-space.

This little unit is great, with indoor and outdoor humidity and temp, in a large easy to read display. Very basic, yet very functional. I would have given it a 5, but for the extremely short remote cord. It's only a couple feet long, it needed to be about 10' long to do what I needed done.

I required a decent quality hydrometer for gardening work. However, I wasn't willing to shell out $300 plus that it takes to obtain a lab quality device. I previously tried one other vendor's electronic device for @ $60, and that was not accurate, and died after two months. I tried an analog device, but had trouble finding one with a decent size face for reading without removal from green house. That required manual calibration, and also was not accurate, and very slow to show changes in humidity. This device is incredibly sensitive and accurate even when reading up to 99%! Large display is easy to read. Anything comparable is hundreds of dollars. yes, it would be nice to have a longer cord, but I understand that would effect it's accuracy and cost.

It's expensive to be curious sometimes, I wanted to know what the humidity and temp was at various levels in my sauna so I got this. It works OK. The sauna itself has a sensor in the ceiling, guess where the temp is the highest. Anyway, I hung the readout at about eye level (sitting) and let the probe hang down to about knee level to get an idea of the temp range. All three readouts show a different temp as expected and to my surprise even the humidity varies by height. Swapping the readout for the remote sensor let me know that the temp and humidity was being read correctly and placing the remote sensor next to the one in the ceiling shows that they disagree by only a couple of degrees. I have no way of checking the accuracy of any of the three temp sensors but they are close enough. The only thing that might be a problem with this item is the size of the cable to the remote sensor, it's pretty thick and there's no way to remove the remote sensor to allow the cable to be pushed though a hole.

I have found mine to be incrediby useful, and reliably accurate. I assume it is always off by 1-2 degrees, but that is alright for my purposes. I used it for my room, a chicken incubator, and the outdoors with consistent readings.

Update 8 Nov 2018: Returning this item to Amazon. CS opened a ticket and attempted to resolve issue but since there is no calibration capability the readout cannot be corrected. I continued to monitor the external sensor readout right next to three other humidity meters of various design. The Extech external sensor readout just continues to vary up to 9% points over the other readouts EVEN THOUGH THE CONDITIONS I MEASURE REMAIN ROCK SOLID AND DO NOT VARY. No Confidence in this item. Update: Amazon helped find a new number for Extech and I spoke to CS. I have a case number and will see if they resolve this issue. Received the Extech 445713 yesterday along with the ThermPro TP-65. Left them in a box and after an hour the Extech showed an 8 to 9% difference between its external sensor in comparison to its own internal sensor and both sensors on the TP-65. Today I tried calling the Extech’s USA customer support number 781-890-7440 and the number is DISCONNECTED. Before I bought this device I noticed the Amazon reviews showed 12% of the total reviews were only 1 STAR. So far I AM DISAPPOINTED. I’ll give it a few more days but as of right now, cannot recommend this particular device or any devices from Extech.

je suis satisfais du produit que j'ai acheté sur ce site. livraison assez rapide, conforme à l'annonce et bien protégé. le produit fonctionne très bien et je le recommande à toute personne qui serait interressée...

Like that I can read indoor and outdoor temps and humidity all one one screen; no need to switch from one to the other. Really like the big display, easy to read. Very satisfied with this product and the shipping was prompt. Highly recommend this product!

Muy buena herramienta de medicion. Solo varia 1°c y 5% de Humedad como especifica en la caja. Buena calidad de plastico en la caratula.

A bit out of speck, but ok

funciona muy bien