HT.w Smart Temperature Sensor & Humidity Sensor - Bluetooth Thermometer and Hygrometer with App Monitoring - Water Resistant Temperature and Humidity Monitor for RV, Humidor, Fridge & More

I was eager to test this to make sure it could measure the inside temperature of my 12V Dometic refrigerator for an upcoming vacation. The first unit I got looked nice, and I had already loaded the app on my phone, and all was very promising. But the battery wouldn't fit perfectly and I couldn't get the app to connect. I sent a very detailed description of the problems on a Sunday afternoon, I got a response within a few hours, and a new one was immediately shipped, and arrived the next day. The battery in the replacement fit perfectly and the app connected immediately. I have had no problems over the last several weeks on the road. (I don't have an Android phone, so I can't speak to its operation.)The temperature recorded has been consistently very accurate, and no calibration has been needed; I haven't tested the humidity for accuracy, but it is consistent with the temperature and the environment it is in. However, my testing has not been rigorous enough to suggest this would be sufficient for, say, precision laboratory use. I have no problem connecting the iPhone with the sensor buried in the refrigerator and the door closed. The iPhone app allows me to set high and low ranges, and I get notifications when the temperature passes those levels. The app produces graphs of the trends, which are exactly what I wanted. In this case, I found it interesting, but not surprising, how the Dometic compressor switches on and off, allowing the mean temperature to rise and fall within the tolerances I need.My experience has been that this is a high quality device, with excellent (iOS) software, from a company that clearly stands behind their product.

Nifty little tool. Using primarily for hatching chicken eggs as I questioned the accuracy on my nutureright 360 and ovabator incubator. I like the data plotting for average temp which is important. The app works great and is very easy to set up and use. I checked accuracy of the unit with a heavy ice bath and it read 31.7F after stabilizing around 15 minutes in. This is within the manufacturers specs of 0.36F. Its not an instant or quick read if thats was youre looking for it takes a few minutes to stabilize at its surrounding temps. Humidity seems to correlate with another hygrometer nearly exactly. Made in USA, would buy again if I find another simultaneous need.

I don't do many reviews. I really only review really bad stuff or really great stuff. This is one great ones.Preface: I only really use the temperature monitoring features. 6 sensors and 2 gateways.Tl:drPros:Setup is stupid simple.Accurate (Plus the ability to calibrate the temperature up or down.)With a Gateway you get Push notifications, email alerts, and app alerts when a temperature or other readings are outside your custom range. Can also check temperatures anywhere you have internet. (with gateway)Also has a web based interface if you don't want to use the app. (with gateway)App shows a wide array of metrics and data and isn't sluggish in doing so.Realtime data trends.Save and view historical data/metricsSmart home/Assistant integration (with gateway)Cons:Price can be a factor here but look at it as an investment in your food preservation!Sensor could be a bit bigger to allow for stronger bluetooth signal.Backstory: Two upright freezers blew from a power overvoltage at night and we didn't notice. Ended up losing thousands of dollars of food. Since then I looked for a well built and, most importantly, ACCURATE and FUNCTIONAL way to monitor multiple freezers and refrigerators with push notifications.After going through a bunch of other sensors I got one of these and tried it for a few months. I was totally blown away. These sensors are very accurate and very responsive to temperature change. The app shows you all the data you could want with near realtime (to the minute) readings, trends, averages, etc all in an easy to read and intuitive interface.The push notifications are where these things turn to gold for me. When paired with a G1 Gateway from SensorPush you can access the data wherever you have internet! But the REAL plus is that you get push notifications, app alerts, and email alerts when a sensor reaches a custom temperature threshold. If I had that before my freezers blew I could have woken up and seen the notifications and then scrambled to save my food.I can't say how pleased I am with these sensors. I can honestly say that I feel better knowing that, should another catastrophe happen to my freezers, these sensors will alert me and I can have time to save my frozen things before they thaw. I will update my review as time goes on. Some of the freezers I have get really cold (as seen in the pictures) so I shall see how resilient they are!

The SensorPush HT.w is a well-built and reliable sensor that works great in a variety of environments. I use multiple units in refrigerators, freezers, indoors, outdoors, and with gateways for remote monitoring. The ability to track temperature and humidity with accuracy makes it an invaluable resource for keeping an eye on conditions wherever I need it.

I ordered a gateway and 4 of the HT.w sensors. The gateway setup easily. The app and online dashboard are both very nice. One issue I had was that one of the four sensors did not work. I swapped batteries with a working sensor and it would still not connect. A little disappointing, considering this is one of the most expensive sensors of this type on the market and is made in the USA. I checked the battery with a meter after it would not connect and then again after a couple hours and the voltage dropped by 0.4 v. There is obviously some sort of internal problem. Will return this one and order a new one. I hope this is just an infant mortality issue and not a long term quality issue.....

The sensor was easy to set up and link to the app. I put it in a crawl space to monitor the temp during the winter and it's been working great! So far, I've just been using Bluetooth to connect to it, and the range is pretty good: no trouble going thru the floor and a wall or two to connect.