Shore A Durometer Test Block Kit/Shore A Durometer Test Blocks. Consists of 7 color coded shore test blocks that range from Shore Ha 30’s to Ha90’s. Designed for periodic verification of calibration accuracy. For use with all Shore A durometers. Shore Test Blocks are not traceable to NIST or any other standard organization. Shore Durometer results should be within +/-3 Shore Durometer Points of stated Shore test block value.