Digital Day Counter
How long ago did you open a food jar?
I bought two of these Digital Day Counters a few years ago. But I really did not start to use them till I began making water and milk kefirs.
Now I just stick one of these suction-cupped timers on a jar of fermenting kefir, and it lets me know how many days it has been fermenting.
Most timers are set up for seconds, minutes, and hours. These tiny timers count up to 99 days. They are water resistant, and yes they work in the refrigerator.