To obtain accurate readings using a durometer, one must develop a proper "feel" for the gauge. Rex Gauge Co.'s Test Block Kit for D durometers gives the user the ability to develop the proper "feel". While not to be used for calibration purposes, the kit also enables the user to perform a quick check for the proper operation of the durometer. 

The kit comes to you in a sturdy magnetic-latching carrying case with the true readings for each block on the inside cover of the case.

Features:

• Custom Case
• Color-Coded Test Blocks
• 7 blocks for Shore A
• 3 blocks for Shore D
• Made in USA