Re: Hand held tach
what kind of handheld tach? there are electronic (ive got one for cars, switches from 2-8 cyls), works great, think I paid $30 10 yrs ago. Ive also got a photometer tach that you point at spinning object, it works great too. It will even read the Hz of ac current when you point it at a light bulb, it sees the flickers. Used on model airplanes point it at the prop and it can read to 35,000 rpm.