Refrigerator digital thermometer housing

thingiverse

I made these for my dad, who works as an AC and refrigerator technician and bought a couple of cheap digital thermometers. They work fine, however they use AG13 batteries and don't have an off switch, draining the batteries when not in use. Just soldering the battery contact points to a single AA battery holder and a switch, he can now turn them off whenever they are not in use and use more commonly availeable AA batteries.