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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
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Old 03-11-2010
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Moisture Meters

There are so many Moisture Meters to choose from, we can't decide which one is best for a fiberglass boat. Any suggestions?
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Old 03-11-2010
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if you search for SailingDogs post I think he and Maine sail recommend the Electro physics brand
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Read Maine Sail's excellent article on using them. You can find it HERE.
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A capacitance-type unit is best. I have the Electrophysics CT-33

DO NOT use a resistance-type unit. These require inserting probes into the sample being tested. People may get upset if, when trying to determine the moisture content of fiberglass cored deck or hull, if you start drilling holes in their boat.
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Last edited by eherlihy; 03-11-2010 at 01:12 PM.
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Great info, Thanx for the help everyone.
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Old 03-20-2010
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If you want direct, absolute moisture values that you can compare with a broad history of other boats, the CT-33 (or its American equivalent) is the only one to get because it's the one that all the professional surveyors use.

If you want to save some money and just be able to trace pathways of water intrusion in your decks, find studs in your home, etc., there are two low-cost pinless meters that I have tested.

This one, available at Home Depot online only for $90+shipping, was very unreliable (unrepeatable), and I would not suggest it:

General Tools Non-Invasive Digital Moisture Meter w/LCD Display - MMD5NP at The Home Depot

This one, available for $50 off the shelf from Home Depot, was very reliable and repeatable. However, in my side-by-side testing with a borrowed CT-33 its absolute values do not correlate directly, probably because its penetration depth is a little less:

Ryobi Accessories :: Pinless Moisture Meter

So for most people I would suggest spending the money for the CT-33. But the $50 Ryobi may work well enough for some people.
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Old 03-21-2010
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We ordered the Ct-33, Thank you Sailnetters.
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