DurometersShore Durometers for use in checking rubber hardness and plastic hardnessCERTIFICATION: The units are not designed to ASTM specifications and cannot be certified as such.DUROMETERSShore A DurometersModel No. PHT-960FEATURES:CERTIFICATION: The units are not designed to ASTM specifications and cannot be certified as such.Shore A scale is for testing the following materials:Rubber: Soft vulcanized ie tire, natural nitrileElastomeretric materials rubber & rubber like: GR-S, GR-1, neopene, thiokol, flexible polyacrylic esters neoprene, thiokol, flexible polyacrilic esters.Other: Wax, felt, leather etc. materials that normally yield under fingernail pressure, such as the heel on your shoe