Frigga M2H Reusable Temperature Humidity Data Logger

Heilyn Rodríguez

September 21, 2026

Good thermometer

Great little thermometer! It’s compact, easy to use, and convenient to keep around for quick temperature checks. I like the simple design and reusable setup.

IEEE

July 23, 2024

Hit and miss

This is a very physically robust data logger. I especially like the tethered cap---some people said it gets in the way but I just use a USB extension cable, I'll accept that inconvenience for the protection of the cap.

When you plug it in, it gives you the data files. The software, like someone else mentioned, is somewhat awkward to use. It's not strictly necessary to use it unless you need to modify parameters like enabling the STOP button, setting temp units, and date format. You'll probably want to do the first one, at the very least. At 700+ MB, it is oddly large. Attached is a screenshot of the software. I had put the logger in my fridge for a few days. You can see the very regular temperature cycles from when the compressor kicks in, and the more irregular humidity ones.

The included manual, to be frank, sucks. It isn't very informative at all. The online one is better but they should include something decent in the box. The logger sometimes has problems registering button presses, I think this is a product of the ruggedized housing.

The included battery was a Panasonic CR2450. The battery compartment has an O-ring which makes it kinda hard to open but I'm glad the O-ring is there for water resistance.

Would I recommend? Eh, I don't know--neutral to very weakly recommend perhaps.

Software Expands the Functionality

The only problem with this logger is the rubber cap on top that makes it hard to plug it securely into a USB port – they should have either made the cap fully removable or included a cable. Otherwise, it seems to be very well constructed. The unit is not rechargeable, but the battery can be replaced; a coin works well to unscrew the battery cover when the time comes.

While this logger works without the software, the default functions are very basic: To start it logging, you press and hold the start button until the blue LED lights; a quick press on the start button after that gives you a brief display of the current measurement, but otherwise the screen is blank (presumably to save battery life). Plugging it into the USB port stops data collection and automatically generates the MS Excel and pdf-report files. That’s the 4 star, basic version of the logger.

However, If you go to their main website, you can download & install their “Frigga Data Center” software; there’s also a pdf download of the software’s instruction manual. The Data Center software lets you adjust the default time zone, allow the stop button to function (the default condition is disabled), set min/max temperature alarms, look at the data/graphs, and transfer data to the cloud. I had no trouble downloading the software and getting it to run under Windows 10. To me, the added functionality of the software raises this to a 5 star logger.

I should note that the software also includes a poorly-explained “21 CFR part 11” feature; it seems that this setting allows you to add password protection to the data file, to create an official record from the temperature/humidity dataset. For so called “cold-chain” use, this feature enables you to create an regulatory record that you’ve kept a medication, or other temperature-sensitive product, under continuous temperature control during storage and/or transport. Although this is not something I personally need to do, I imagine it would be a valuable commercial feature for some.

Very sturdy and compact temp and humidity logger

I'm definitely not the normal target audience for this. I got this to track the weather on backpacking trips to help better understand what temperature range our sleeping gear and clothing is good for so we can pack better.

I was a bit disappointed that the manual wasn't included, I had to download it. The 5.5 x 8 inch card with the download information could have contained the instructions. When I printed them out, they're two 5.5 x 8 pages.

The device itself seems very sturdy. It's clearly intended for use in more sophisticated application because it has a scannable and human readable ID as well as an expiration date (the battery is replaceable though).

Starting the device up and collecting data was easy. The cap could have been designed better - it's in the way when you're plugging the device in to get data. Very awkward if you're plugging into the back of a computer or the side of a laptop. Regular users will want a cable.

In addition to a CSV file with all the datapoints, it generated a PDF with a nice graph and summary statistics on one page (the photo shows part of it) and then another page of all the data points. The PDF uses something I've never seen before to prevent data tampering. Very nice!

The instructions mention an app that you can use to change the settings, I didn't try this.

Robbyg

February 27, 2024

Works Perfectly

This is the third Temperature unit that I have bought in order to log the Temperature in the Attic over a period of months to see how much heating or cooling is being wasted. All the other units I tried were Ok but not great. This one is the first one that works perfectly and uses very little battery power.

It has software that you can download to change the settings for sampling time and the display but I am happy with it is as is. I just plug it into a USB port and it opens like a thumb drive. Inside is a nice excel file that displays all the results. The build quality of this temperature logger is extremely good.