Temperature / environment sensor with a probe/wire?

[ritchierich]

Similar question asked recently:

Open/Closed Sensor with EXTERNAL temperature probe

I'd like to retrofit my old SubZero refrigerator and freezer with door and temperature alarms. Lots of open/closed sensors available that would work perfectly. Its the temperature monitoring bit that is more challenging. I've tried a few different temperature sensors inside the units, but range is terrible (obviously) and battery life is bad in the fridge and dismal in the freezer. So, a device that uses an external temperature probe would be better, won't have range or battery problems. Th…