Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I bought one of these laser tachs and it worked fine for a while, then quit. It was so cheap, though, that I bought another.

When I was about to throw the first one out, I decided to poke around it with a multimeter, and found that the problem was in the battery connector.

Now I have two! Both are great, especially when used with my lathe and milling machine.