[ClumsyPilot]

Also one sold by the Pi-hut: https://thepihut.com/products/lithium-ion-coin-cell-charger

After someone nicked my electronic calipers, I also got mechanical ones - they are perfectly adequate for all home use so far.

I used to use electric ones for 3D prints and designs, and haven't tries that since - might not be able to get the same perfect results with mechanical ones.