Quote Originally Posted by Rodsmachineshop View Post
just mic it it .125 thickness rod . what i est only need like 12 inches long since when i put my ground clamp at the very way to low on amps . dont touch the welding rod gets hot lol
I suppose if somebody was into the maths, he could calculate the resistance for a particular rod and get some semblance of accuracy.

I like Rambozo's battery tester idea, I'll have to be on the lookout for one of those.