same/same here .... and even on plastic .... the reading is only in MM ... but that is EZ to convert ....
I think that probe needs to be about .100 or so to read concave or convex shapes ...
The unit I bought reads in MM or thousandths.. I wanted one that I didnt need to convert and it has a program and cable to take the reading to a graft.. when I get done with my other jobs I'll get back on the tube and contouring the probe
