I used these [1] with remote thermocouples to track temp mostly in curing epoxy for my biz, but also for freezers. They work great, and should for your freezer

I used these [1] with remote thermocouples to track temp mostly in curing epoxy for my biz, but also for freezers. They work great, and should for your freezer application too. Get the one with the display and you can view the current/hi/lo temps anytime, and grab the data for extended review. I've found that I can see the freezer's on-off cycles very well, pretty much the expected sawtooth wave... [1] https://www.lascarelectronics.com/data-loggers/all?type=usb https://www.lascarelectronics.com/data-loggers/all?type=usb edit: no commercial connection, just a happy customer