DUROMETERS. Shore D Durometer Test Block Kit. FEATURES: Consists of 3 color coded Shore test blocks that range from Shore HD30’s to HD90’s. Designed for periodic verification of calibration accuracy. For use with all Shore D durometers. Shore Test Blocks are not Traceable to NIST or any other standard organization. Shore Durometer results should be within +/-3 Durometer Points of stated Shore test block value