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Its 8mm.. I want to test it when I get home to see
if I need to grind the probe housing.. but at 8mm
I dont think I will

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.315 ? ... I think that is toooo wide. I think mine is .250 and my chassis guy says(IIRC) that it needs to be .125 or so to fully contact the material being measured.

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It gave a min bore spec that it could read.. it was
in the 3" range... if I need to grind the housing I will
it only has a single bar in the center for the signal
EDIT
I know the meter I use to bring home from work had a
larger probe than a 1/8"(.125).. I'm sure it was over
a 1/4"(.250) and it read great... did you ever try yours