I have*a model CT-33*you can find it here** http://www.electrophysics.on.ca/e_index.htm
Also have the calibration plate.
It is easy to use, not so simple to interperet. I used it a lot on my old Mainship 34 and it pin pointed all the areas with wet core, however one area the meter showed wet*but all the core samples were dry. Oh well, it's not perfect.
I used it to to cull out several boats when I was looking to buy a trawler, and it definately helped me. As a matter of fact the surveyor I got for my current boat had the same moisture meter.**
I think a lot depends upon the core material, in other words balsa core reads differently than plywood, etc.
Ralph borrowed my meter prior to getting his hull peeled and he kept records of how it "dried" while on thehard *so perhaps he can comment on how it works on solid fiberglass surfaces.
-- Edited by jleonard on Monday 13th of September 2010 10:51:19 AM