Extech RHT3 EzSmart Hygro-Thermometer

Seems like a good product for occasional humidity/temperature readings if you are monitoring an area over a period of time.Unfortunately, unless you are still using an Android phone from 2013, the item and companion app are useless.How about an updated app for Android? Or at least state explicitly in the description that it will not work with newer phones?

Great humidity tester with a nicely concocted smart phone app. Useful, compact and priced right.

I think this is oversold - reading the ad copy makes quite a few claims about finding leaks and such, but this is too simple of a tool for such work. It's a hygrometer. It will tell you the relative humidity as well as a few calculations, but that's really about it. For continuous monitoring inside a humidor, this would be good if not overkill...but in sum, this is about it.Used for what it is, I have no complaints. I will say that I don't generally trust out-of-the-box calibrations for hygrometers, though calibrating this is a bit of a pain in the tookus owing that it needs to be plugged into a device to work. So no leaving it in a known-humidity environment for a few hours (or days) is a bit of a non starter. Response time to changes is not bad, but not stellar either - about as expected.Then, if you don't have a headphone jack on the phone (iPhone X here....) an adapter is required.The app is straightforward and does lay out the information in a simple and focused way, but again...the data being analyzed here isn't that voluminous. It's not a miracle device. It will give you a second data point (or a first) if you want to measure localized humidity. No more, no less. Good for what it is, but between the price and the promises I'm not over the moon with it.

This is pretty cool. It turns my iPhone 6+ into a scientific instrument with the free app.My phone is in an Otter Box waterproof case, so I had to use this with the adapter cable for the headphone port, but it worked fine once I got everything seated firmly. The app lets you take readings of temperature and humidity, log them with a photo of the place being tested along with the geographic coordinates, date, and time, and a bit more. I'm still figuring it all out, but so far it works as advertised. I don't really have a serious need for this kind of information, but I can see the potential. I plan to show it to the guy in charge of safety in my work place; we have incubators, cold rooms, lab instruments, etc. and being able to document the environmental conditions around the building is of real interest.If I were in the insurance business, evaluating flood damage or inspecting buildings, I can see where this would be really useful. You could measure exactly how damp a basement was, for example. Or, you can use it for your own weather monitoring. If you're a pilot, knowing the temperature and dew point where you are is important for planning a flight. This is roughly the size and weight of a thumb drive memory stick, so packing it in a flight bag would be simple enough. I don't know if it would work with an iPad - it would be worth downloading the free app to see if that runs, and play with the simulation mode before buying the unit. If you're already doing flight planning and keeping nav charts on an iPad, adding this makes sense.It's ingenious how Extech has managed to make use of the computing power in a smart phone and its existing hardware to add new capabilities with a well designed sensor package. Plug and play - it uses the phone's own power to work, so you don't need to worry about batteries or power adapters. If this keeps up, pretty soon we should see add-ons that will turn smart phones into the equivalent of a Star Trek Tri-corder. This looks like the first iteration of the software app, which is a little rough but usable. It should only improve with customer feedback and field experience.

I really wanted this Extech thermometer and humidity meter but wasn't sure if it would work on a modern iPhone. I decided to give it a try and used the headphone adapter that came with my phone and sure enough it works great! Monitors temperature and humidity and graphs the data over time if you want. One downside of using an iPhone for this is you can't keep it charged and keep the unit plugged in at the same time unless you have a wireless charging plate. Then it will work.I also tested this on an Android phone with Android 7.1 and it works just as well. You need to give the meter a few minutes to settle after you touch it because heat from your hands will increase the reading temporarily.Overall, this thermometer works well and gives fast temp and humidity reading anytime you need them. A nice simple but very useful little tool.