greybeard
Herd Master
Not sure how to retrofit that.. maybe a temp gauge that beeps on your phone when it drops below temp?
Or, a spring hinge that will automatically close the freezer door?
They are available as aftermarket and Model specific or if it's an old freezer and you don't mind a bit of 'rustic' look, a spring hinge like is used on many french (think saloon) doors.
alarms...
There's a link in each of the 4 devices listed below. (1st one is just a thermometer) Follow them for prices and more info:
http://www.freezerhub.com/freezer-alarms.html
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