I am looking at a used PlasmaCam rig and am wondering how to tell the difference between a 98z, DHC, or DHC2? The shop that has it does not have a lot of information on it other than it is blue and it is a plasmacam. The price is right but I don't really have a day to waste looking at it if it is a 98Z without torch height control. Plus is there a lot of functional difference between a DHC and a DHC2?