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I too have been thinking about one of those ones from Ebay but think the probe needs to be a ball shape or very small. How has it been working with that .375 probe?

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Well its .315 but I'm not home YET to use it.. IF
need be I will contour the probe face to get the radius
that I want/need... I'm thinking about making a cage
to hold the probe for reading OD of tubing just so
its square on the tubing... might end up making something
for the ID stuff also... I will see when I start playing
with it when I get home(still on winter vacation)
EDIT
The first thing I'll do is spin up a 4" ID tube on
the lathe with a certain wall thickness and test it
as is and see what the discrepancy is.. if any then
contour the probe face and keep looking to see if
it reads correct