Review on 🚗 Electronic Specialties EZ-Tach 325: The Ultimate Digital Automotive Tachometer for Precision Measurement by Antonio Moore

Bought this device to adjust idle/max speed on various external power devices with small motors. When I hooked it up to the snow thrower, the readings were very erratic. I decided to test the device on my car. In this application it worked fine and showed the same value as the tachometer on the dashboard. There is a sticker on the box that says "Automotive use only" and that the Model 321 should be used on small engines. I would like the information to be prominently displayed in the online description. The description says "any car engine with a spark plug wire" which I have interpreted as any 4-stroke petrol engine. By the way, the 321 model is three times more expensive.