Watch escapement meters are used to adjust, in a methodical and measured fashion, watch pallet stone depth while the shellac holding the stones is heated. This adjustment is crucial to optimal escapement operation. This tool is used over a specialized hot plate where, nose to the table, the watchmaker risks serious burns to his nose and hands to assure your watch is as good as it can be ;-) Not every watchmaker owns this tool but they should. The second picture shows both old and new versions of the tool.
