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Re: Is there an affordable moisture meter?
I recently finished testing a General Tools MMD7NP against a Protimiter Aquant BLD5765. Both meters have a 3/4" sensing depth, and a digital readout coupled with a moisture bar graph going from "dry" to "wet". The Protimeter although used for many materials, it does prove useful in marine applications, and runs around $300-$400. The boat tested was a C&C 30 with balsa cored decks. Testing was on the port side deck, forward of the chainplates. I used the MMD7NP on "Wall" mode as a previous poster mentioned. Although the numeric readouts are different, the LED bar graphs on both indicated the same degree of moisture. In known dry areas, the Protimeter ranged from 80 to 93, and the General measured 4 to 9. As we worked towards the known wet areas, the Protimeter climbed up to 238, and the General up to 80 in the area with the highest moisture. Both meters were indicating "wet" on their bar graphs at this point. Erratic readings occured on both meters if they were in close proximity to any metal. Take this information as you wish, but my conclusion is that the $48 General can accurately detect moisture in balsa cored decks, and if the top skin of glass does not exceed the sensing depth. If I was a surveyor, I would spend the extra on a higher quality tool such as the Protimeter, but for a DIYer such as myself, the General MMD7NP is a useful piece of kit IMO.
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