fridge alarm responds to temperature

this is a nothing of a technology that could benefit 100,000s of thousands or possibly a million commercial freezer users.

As commercial freezers these have to maintain food at a particular temperature range. Incredibly, some of these are hand-logged, and then they submit the data to agencies or other compliance people.

Now one obvious answer is the networked refrigerator, but are these cheap? And what about the millions of preexisting freezers worldwide? Data loggers are another obvious idea, they just need to be paired with an audio element loud enough to hear through a freezer door.

But it is possible to go cheaper with something like a smoke alarm. it makes noise when it detects something. Just have a temperature sensor attached to the alarm, when it goes off the person looks at the display and notes the date. they also adjust the fridge.

Most importantly this replaces log based compliance with exception based compliance, causing fridges that work well, for years at a time, to remain in approval without paperwork.

Like I said, not much of an idea, but beneficial to up to a million.