Round Shore D Type Durometer Scale Large LCD Digital Display Hardness Tester Tire Hard Hat Plastic Skateboard Wheel Measure Range 0 - 100 HD Pocket Size Portable Designed to measure the penetration hardness of harder elastomers, polymers and rubbers Digital durometer for Shore D hardness testing; Easy to use on the shop floor Pocket-sized model: 3 1/4 L x 2 1/4 W x 1 H Inches, portable with foam-fitted carrying case The tester is featured with wide measuring range from 0 to 100 HD, 30angle with 0.5HD resolution Features data hold function and zero button for self calibration