PRG, Inc. (Preservation Resource Group) is a mail order company, since 1975, that caters to preservation / restoration / conservation professionals and those charged with the maintenance of historic structures and objects. In the PRG on-line Catalog, you will find a variety of precision instruments, quality tools and useful products.
Building Evaluation tools such as Crack Monitors and Rilem Tubes (for measuring water absorption). Resistance Moisture Meters for measuring moisture levels in wood as well as surface salt contamination on masonry and rendered surfaces. Radiofrequency Moisture Meters can be used for measuring relative moisture levels in masonry and rendering materials.