Frigga M2H Reusable Temperature Humidity Data Logger Multi-Use USB Digital Temperature Recorder 28800 Points High Accuracy Refrigerator Thermometer Logger PDF CSV Report

This device works excellently. It is multifunctional and suitable for use in various settings. It is high-quality and reliable.

The Fridge does exactly what I want it to do. Measure, log and graph the temperature of my refrigerator and freezer.

It says you don't need software on your computer to read the data on it. What they don't say is that you do need software on your computer to set it up. For MacOS, that software is available on the Apple App Store, so that should be safe, right? Sure, until that app then automatically downloads other software directly from their web site, a DMG that contains a PKG, which you are required to install for the device to be configured, which then installs a service on your computer that runs all the time. As root. Then the "Uninstall" application that they provide is a binary command-line application, which Crowdstrike (antivirus, effectively) kills as suspicious. I was able to unpack the PKG file and figure out what it would do and undo that manually, but anyone who isn't a reasonable expert at MacOS administration will just have a process from "Shanghai Dewav IoT Technology Co., Ltd" running on their computer, as root, for eternity. There is just no need for this at all, and it's genuinely suspicious.

usb only, nothing wireless. If you're asking it the usb plug janky, nothing crazy but I haven't dropped it or crushed anything.

Constantly having to change batteries.

I tested these out in a refrigerator and freezer. The logs identified the periodic temp drop from the defrost fan, but that the temp drop was still in the freezing temp zone I need. These are very easy to use, unlike some other loggers I've tired. I just pushed the record button until I got confirmation and put them in the areas to be sampled. The reports were super easy as well. I stopped the data logging with the stop button and attached them to my mac and the reports were auto generated upon connection. Super simple. The only cons are that the battery life in cold conditions is reduced. The one in the freezer was showing low battery after 5 days. The one in the refrigerator had enough to keep going. This is a limitation of the device because of how they decided to power it. Colder temps reduce battery efficiency and they decided to use small batteries that don't offer a lot of run time in cold temps.

Works great, high accuracy, and love that it also collects humidity data. If you're looking for a temperature logger this is a great choice. There are also a lot of customization options if you download the frigga software (change the units F/C and set the recording delay).

Multiple report types. Great information. inexpensive. I have used this to track issues in several buildings. Couldn't have found the problems without this data logger.