Review on 🔍 Enhanced Precision and Functionality: Protmex Reflective Tachometer by Luke Hodes

I tried it directly with my cordless drill. Used shiny tape and all, it either read nothing at all or said my drill was running at 87k rpm when it was at low speed. I thought that maybe the light is interfering, but I went into a completely dark room and saw the same thing: the drill read either 90,000 or 55,000 or 0 or about 1 try out of 10, it read right at 400rpm No Worky Worky, send back. Bought to test CNC spindle speed and it doesn't work at all.