Being old school, I never owned one back in the days when I was twirling wrenches for a living—-nor did any one else. But in more modern days things are better now. Anyhoo, I still don’t own a “real” one, but I did cobble up an adapter. The actual parts cost less than a buck, plus however fancy you want to get as far as a case, test leads, etc. The circuit floats all over the Internet. Here is one version. I will say that people go nuts over the capacitor, tending to use one that is way too big. The one I used is only 0.2 ufd and it works for me.
