There's a tool "roach coach" that comes around my area. he mainly deals with secondhand tools. Today I found a Snap-On MT254 unit in the truck. Does not have the MT160 luminosity probe with it. You will need that to make the whole thing work. I already have one, so it is of no value to me. those of you who are local to my area, he wants $60 for it. PM me and I will send contact info.