HT1 Smart Temperature Sensor and Humidity Sensor - Bluetooth Thermometer and Hygrometer with App Monitoring - Indoor/Outdoor Temperature and Humidity Monitor for RV, Humidor, Fridge & More (1 Pack)

After loosing two freezers full of food, I decided I needed a sensor that would work in a freezer in the bay of my motor home. After having two different ones that worked on a freezer and refrigerator, different brands, and not working underneath in a compartment, I decided to try the Sensor Push. Amazing! I am not a technocrat, and having read some of the review about lack of documentation, I went for it. Received in one day, opened the box, unpacked it, looked at the documentation ... yep, 4 pictures. Picture 1 Smart phone with ICON for play store and ICON for app store. Simple. Opened Samsung Galaxy S10 and downloaded and installed the app for Sensor Plus. Picture didn't say Sensor Plus, but after experience with 300 plus other apps, it is normal to push the mic button and say the name of what you have in your hand. Sensor Plus! Nice. Downloaded and installed in seconds, which looked like the second picture. 3 picture looked easy enough ... answer yes to allow location and turn on bluetooth. Picture 4 ... this is the hard part, a picture of the sensor appeared on-screen and said to place the sensor over the picture. Just like that we are hooked up and connected to blue tooth. From there, no more pictures in the booklet. But, looking at the phone the screen showed the name of the sensor (I changed it to represent the location it would be used), next temperature with a little line with MIN and MAX, with an option for an alert. I want to know when the freezer changes from it's normal 0 degrees to 15 degrees, which allows me time to pull off the road and open the compartment and take investigate why the freezer has changed, before things start thawing above 32 degrees. Same option for humidity, which I skipped quickly by, and then options to calibrate temperature and humidity. They were already at room temp, so until I found an oven or other thermometer to use to calibrate, I left factory temps alone. Hit the done sign, and placed the sensor in the freezer. Waited and watch the temperature of the sensor start to drop. Closed freezer tightly, closed the compartment, and took a seat outside with no metal around about 20 feet away. Neat, Hit the name of the sensor and two graphs ... one for temperature and one for humidity. Both falling as the sensor started getting cold. Watching over time, I can see where the temperature starts to rise, and then the compressor kicks back in and the temperature starts to drop one again. Would I buy one again! Of course, now the wife wants one inside the refrigerator as well. Since we normally have wifi when traveling, I ordered one more sensor for the refrigerator and the gateway sensor, so when we stop and leave the coach unattended, we will know if any issues develop. Great product and I expect the second sensor and the gateway to be of the same high quality standard. Will update if any issues.Batteries ... should last 1 - 2 years under normal warm conditions, so since the sensors will be refrigerated and frozen, I ordered a 5 pack of CR2477s for insurance. Amazon will ship anywhere we go, but until we find out exactly how long the last under extreme conditions, I'll carry enough to get me to the next required battery change and order more.UPDATE: Bought second sensor and G1 Gateway. This was too easy to hook up. 11 days and no more lost food. All components work well together and with the Gateway, food temps can be monitored while away. So far battery in sensor has dropped to 2.7v in 11 days, this is definitely in extremely cold freezer. Gateway is 20 feet away and monitoring two sensors without issue. Will buy another set for the house. These work well in a motor home surrounded by metal and all kinds of electronic components.

Easy to setup. I have used these sensors to monitor building moisture loads and for leak detection using both bluetooth for data downloads and also, for more remote monitoring, the gateway, so data can be downloaded from the internet. Reasonably reliable...I have only had issue with maybe 5 out of 100 after 1 to 2 years of monitoring. Battery life has averaged between 18 and 24 months. When placed in wall or roof cavities, I use an access panel so I can retrieve the sensor when battery replacement is necessary. I also use these in our lab's environmental chamber that does not have data acquisition. The sensor accuracy and precision are appropriate for many ASTM standards that we run. The Sensorpush software allows calibration of the temp and humidity of each sensor in 0.1 (F or %) increments.

This temperature sensor does an excellent job monitoring the temperature and humidity in my greenhouse. It is very simple to set up and accurately sends me alerts if the temperature falls too low. Certainly worth the money for my peace of mind. I rarely write reviews and have had this sensor for over 2 years with no issues, recently I had to change out the battery for the first time and had a question I needed to contact customer service about. I send an email on a weekend, early evening, expecting a response the following week, however I quickly received a response and the issue was resolved the same evening. I couldn’t ask for better customer service. It is impressive to have a business stand by their product as SensorPush does. I would highly recommend this sensor for anyone needing to monitor temperature and humidity and the outstanding customer service is a bonus.

If it was truly smart & could hook-up to my WI-FI without purchasing a hundred dollar gateway, this sensor would be perfect. It's located in a detached "hobby room". Without the gateway, I'm limited to Bluetooth distance for connectivity to the information it provides.My air conditioning, heat, & humidity are all smart connected to the propertys' Wi-Fi. Knowing the history of the "weather" in my hobby room is very helpful. Controlling the weather from anywhere is a benifit of current technology. I love the graphics of the app. The ability to fine tune the temperature & humidity values of the sensor, so it matches other old fashion probes, is an added benefit. Very easy to to set up and use.Great product. I will buy more sensors in the future