The one that I have came from my father in law's tools. I purchased one for school in the early 80's when I taught a power mechanics class The class they took before Auto Mechanics. My guess is that it was the same from the 50's to the 90's.
I got my vintage Stewart Warner contact tachometer today. I can’t wait to check the 782 rpms with it!
Plus, it came in a nice tin.
I appreciate the "old tech" but there is a battery powered,hand held rpm reader.Pretty simple cut off a small piece of reflector tape ,put on item to be read.Point laser beam at tape when running and poof ,you're now high tech. Less than $30. Amazon ??
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