2 Pack Temperature Hygrometer Monitor, Indoor Thermometer and Humidity Sensor with App Notifications, Mini Bluetooth Thermometer Digital Device

I bought this mainly to use in the filament dryer of my 3D printer. I bought the two pack because I plan to leave one of them in the filament dryer permanently and the other can be used for other purposes. These come with the batteries already installed so you first have to pop off the back cover to remove a little plastic tab to allow the batteries to work. Once that is done, the display shows the temp and humidity levels. It first comes up in degrees C so you have to press the button on the top of the unit to change the display to F. Once I had the display set to degrees F, I compared the temp and humidity readings to the only other device I have in my house that can show temp and humidity which is an indoor display of my weather instruments and I was pleased to see that they were very close. When I looked at the second unit, the readings were different. I opened the Inkbird app on my phone and it instantly recognized the devices and it was able to display the readings from the sensors. It was through the app that I was able to calibrate the readings on the second sensor. I was also able to rename the sensors through the app so that I could more easily know which was which. I then placed one of the sensors outside and let it sit for a few minutes before I took a reading. I then compared this reading to the weather app on my phone and the readings were very close so it seems that these devices are accurate. The next test was to place one of the devices into my 3D Printer dryer box and take a reading. My 3D printer is in my hot Florida garage so knowing when to turn the filament dryer on is important to get good quality prints. It was 89.7 degrees and humidity of 60%. I turned on the filament dryer for two hours and the reading was 104.3 degrees and 43% humidity so that indicated that the filament had dried sufficiently to make some prints. I mounted the hygrometer to the dryer with a piece of double sided tape and it appears that I can leave it in there even while printed. I have done several prints since mounting it with no problems. I have placed the second unit in my attic because I want to get an idea of how hot it gets there so I can compare it to the temperature of the garage ceiling that I can measure with my Inkbird infrared thermometer. I can hopefully then decide if I should add more insulation. In summary I can say that this is a very good unit that can be used in a variety of situations and at a very good price.

I recently started using the Inkbird ITH-13-B Temperature & Humidity Monitor, and honestly, it’s become a subtle yet important part of my grow tent and bedrooms. Setup & App Experience: Straight out of the box, setup was smooth. The Bluetooth connection paired instantly and reliably. The app gives me real-time updates on temperature and humidity, complete with VPD and dew point tracking, which is more sophisticated than I expected at this price. Accuracy & Sensor Performance: The device uses Swiss-made Sensirion sensors, giving temperature readings accurate to ±0.2 °C (±0.36 °F) and humidity to within ±2%. I cross-checked it against another calibrated monitor, and it held up impressively well. Data & Historical Trends: This little unit stores up to 300 days of offline data and even allows you to export up to two years of historical insights, which is perfect for long-term tracking. Design: Physically, it’s compact with a clear display and gives you the flexibility of placing it on a desk or hanging it up. It fits almost anywhere. Connectivity Consideration: The only real catch is Bluetooth range can vary depending on walls or interference. While the spec says up to 230 ft (70 m) in open space, performance may dip in more complex environments. Just something to be aware of depending on where you put it. --- Final Thoughts: This monitor nails the essentials with excellent accuracy, seamless app integration, long battery life, and robust data tracking, all in a neat, unobtrusive package. Whether it's for growing spaces, baby rooms, or general home comfort, it delivers. Just keep placement in mind for Bluetooth signal strength.

Works good but battery only lasts about 3 weeks. Takes 2x AAA and battery level goes down by 5% each day. It’s Bluetooth so you need to be within 20-30 ft to use the app to check temperature.

If you’re a 3D printing enthusiast or professional, you know that filament storage is crucial for preserving the quality of your materials. Filament, especially types like PLA, ABS, and Nylon, is sensitive to humidity, and exposure to moisture can ruin its printability and strength. That's where the 2 Pack Temperature Hygrometer Monitor comes in—an effective and easy solution for monitoring the humidity in your 3D printing filament storage container. Design & Setup This product comes with two compact devices that are easy to place inside your filament storage box or drying cabinet. These hygrometers are small, but feature a clear digital display that shows both the temperature and humidity levels in real-time. The setup is simple—just pair each device with your smartphone via Bluetooth, and you’re ready to go. Key Features: Bluetooth Connectivity: The monitor pairs with your smartphone, sending real-time updates directly to your app. This ensures you’re always aware of the conditions inside your filament storage container, even when you're not physically near it. Accurate Measurement: The sensor is known for its accuracy in detecting small changes in humidity, which is essential for 3D printing materials, as even minor fluctuations can lead to filament degradation over time. Dual-Pack for Flexibility: With two units in the pack, you can monitor different compartments of your storage or use one for filament and the other for another 3D printing material or location. I personally use two of these monitors for my house and office at work, which adds extra versatility to how I can keep track of the environment in multiple locations.

The packaging was very professional and I could not believe the size of the box, at first I thought I only ordered one, but there were two in that box. The size is very compact but easy to read, in the day light, night time, not so much. It would have been nice if there was some sort of back lighting. Next I removed the instruction booklet, again, small but not terribly hard to read. The units you get come with everything needed to get started, batteries are already in place, I then opened the backs on the units and removed the little insulating tab from the battery and then closed the back cover on the units. That fired up the units and quickly the temperature, humidity and other indicators came to life. To switch from C° to F° was a simple press of the button on top of the Thermo-Hygrometer. It has a Min-Max fiction but I found this a little annoying, a fast constant back and forth of the high and then the low, a preference to either slow this down or eliminate it all together would be recommended. By the way, a long press on the button on the top resets the Min-Max, if that’s important to you. There is a keyhole slot on the back to hang the units on the wall or you can use the kickstand on the back to set them at an angle on a flat surface or using neither and the unit sits flat on a flat surface like a desk. Next I opened up the Inkbird app on the iPhone and did a search for the new product. Once I found the ITH-13-B the app recognized the two unites and they were now available in the Inkbird app. It took me longer to find the Thermo-Hygrometer in the vast amount of products on the device page than the install of the product. I then customized the name on both unites and lucky for me I did not have to calibrate the temperature on either altho one did require that I adjust the humidity. I calibrated the two unites with a know accurate device for the temperature and humidity. As I was doing the setup a window popped up that a firmware update was available going from 1.1.1 to 1.1.2 and that also can be found by selecting the setup gear icon at the top right of the app then go to the bottom of that page where you will see “Firmware version >” . The Temperature and Relative Humidity charts are 1 hour, 1 Day, 1 Week are easy to read and color coded, but in the short time I have had these units the 1 Month and 1 Year charts did not change from the 1 Week. I assume after a month and a year the charts will start to make sense. I didn’t bother with the Dew Point and VPD on that same page. It will be interesting to see how long the batteries last, according to the description on Amazon they should lat 8 months, time will tell. I would recommend these units for anyone wanting to monitor the temperature and humidity of various rooms, or maybe other locations like in 3D printers, humidors, greenhouse, the possibilities are endless.

Here’s a short positive review for the Temperature Hygrometer Monitor: ⸻ I recently purchased this temperature & humidity monitor and it has been a surprisingly smart addition to my home setup. The readings have been consistent and reliable, and I love that it gives both temperature and humidity at a glance. The app control is a standout — being able to check conditions remotely gives me peace of mind, especially in our plant corner. The LCD display is clear and easy to read from across the room, and the export-data feature is a nice bonus for tracking trends over time. In short: a well-designed little gadget that delivers on functionality and gives added value beyond the basics.

Very accurate and convenient way to check on the temperatures of my vehicles in the summer and winter time. Bluetooth works at around 25-30 feet away; if your in a building within that range and try to access the function than it is not reliable. The app is good and useful to download the data from the thermostats.

Thermometer works fine, but the app requires a user account and wifi/data connection to operate. I assumed it would be a simple bluetooth connection to communicate with the device, but it's really just an excuse to collect and sell your personal data. Disappointing. Will be returning.