Thickness gauges with CR2025 battery

CR2025 battery

— replaceable batteries — "tablets" in the form factor CR2032 or LIR2032. Both those and others have a diameter of 20 mm and a thickness of 3.2 mm, and differ only in that the former are disposable, and the latter are rechargeable. Such elements are used in the most compact thickness gauges, where there is little space for a power source. Also note that, unlike most other replaceable batteries, the "tablet" is usually immediately supplied with the device. However, in the case of disposable batteries, you still have to periodically buy fresh cells to replace dead ones. Batteries do not have this drawback, but they themselves are more expensive.