Do any of these devices alert when the electricity is cut? I never hear talk about this but I had this happen -- power went out while I was on vacation and I didn't figure it out until much later when I tried to cook some of the food from the freezer.
There are many options for simple digital refrigerator/freezer thermometers that will show you a historical maximum, for that particular issue, some of which have smart integrations. There are also "maximum-registering" analog thermometers with a little indicator that gets pushed along as the needle goes up, then stays in place when it drops again.
