Extech 445713 Big Digit Indoor/Outdoor Hygro-Thermometer

I recently got a Ball Python and use this in his aquarium to monitor the hot and cool side as well as humidity. It works extremely well for this purpose - having the ability to monitor heat and humidity at the same time is awesome and it's definitely much more accurate than the cheap round dials the pet store throws at you!

Wish the cord for the sensor was about a foot or two longer, kinda short. Unit is otherwise perfect and damned accurate and easy to read, not a million buttons to press. Shows everything u need on one screen!

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.

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.

I have the humidor under constant surveillance now !

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.

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 !

I had thought that I was buying a precision piece of test equipment By "Extech" which is more then likely some kind of made up chinese name to make sound good. After placing the battery in I notice the humitity and the temp for inside and out were complete different. Let it settle for a little while and took it outside and let it sit. Same thing both indoor and outdoor were 10 degrees off on temp and no where near the same om humidity. I would file this this as chicom JUNK. Do not but anything that is made by Extech its a chinese scam.