While shopping for sensors, I came across these tiny wall meters for temperature and humidity powered by a button cell for a couple of bucks each. I've stuck them to the wall in a couple of rooms with double-sided tape. I think COM 🙂 means comfortable, not COM port 🙂.

That reminded me of the time a poster to a forum wrote about the "comfortability" of a pair of shoes. I was bemused by how a noun, comfort, turned into an adjective by suffixing, comfortable, was turned back to an invented noun, "comfortability".

Some time later:

The cells in the wall meters ran out. They can be replaced, you just have to remove the back from the case, or if they are stuck to the wall, pull the front off. The cell is an AG10. I didn't have one on hand but I noticed that the LR41s I had were almost the same thickness and smaller. Long story short, the LR41 worked here. Maybe a shorter life. Next time I'm in a country with cheap cells I'll buy some AG10s.