Originally Posted by Gayle
Dead blow hammer is usually a lead/copper or thick plastic or rubber hammer filled with sand. The sand deadens the recoil so that the force is applied to the object youre smashing. Think trying to get rusted rotors off of a hub... you dont want a metal hammer it will just bounce.
Pyrometer measures temperature usually on exhaust or head. I don't know why you would need that unless you're trying to do headgaskets and need to warm the head up to a certain temperature or something.
A wobble wrench is an open ended wrench that has a pivoting section so you can fit in tight areas. Basically i'd rather have a short handled 12mm wrench than a 12mm wobbler