SPI Digital Durometer Shore D Designed to test the hardness of plastic and rubber materials. This Durometer has an ergonomic, lightweight design that assists in taking precise and consistent measurements. Specifications include... Measuring range: 0 - 100 HSA/HSD. Resolution: 0.5 H Deviation: Accuracy: +1 HSA/HSD Conforms to ASTM D-2240, ISO 7619 and DIN 53505 standards. Furnished in fitted case.