The X High Performance Shore Durometer is a shore durometer that features portable design, ease of operation, non-destructive measurement and optional peak indicators. Supplied with 3 point NIST traceable calibration cert. The X High Performance Shore Durometer is a precision instrument thathas an accuracy of .75 point and is available in Type F for soft materials like sponge rubber and urethane foam. Asker models are available in ASTM D 2240 durometer Types: Shore A Hardness, Shore D Hardness and Asker C Hardness durometer scales.