Hardness Test Block kits designed to help maintain Durometer read-out accuracy. 

Shore "A" for Soft Rubber, Soft Metals, Waxes, etc. 

Includes: (7) Color-coded rubber test blocks with various nominal durometer hardness values ranging from 30 to 90 in increments of 10. Block size: 2" x 2" x 1/4". Calibrated but not certified.