I have an Iris V2 contact sensor in my freezer. I’ve got it inside a tiny ziploc bag and use it just for temperature. Depending upon where I put it, it reads between -10°F (bottom) and 5°F (door). It gets about 9 months of battery life (CR2).
I have an Iris V2 contact sensor in my freezer. I’ve got it inside a tiny ziploc bag and use it just for temperature. Depending upon where I put it, it reads between -10°F (bottom) and 5°F (door). It gets about 9 months of battery life (CR2).