A method is provided for calibrating a moisture meter to a particular settable slurry product for determining the relative dryness of the product. The steps of the method include determining the appropriate relative dryness of the particular slurry product, associating a moisture meter reading with the appropriate relative dryness to achieve a meter value, determining the relative spacing of the meter from a conductive surface for obtaining the associated meter value and providing a spacer having the relative spacing for calibrating subsequent meters for measuring the relative dryness of the settable slurry product.
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