SPI Standard Test Block,80 HRA to 88 HRA Hardness

80 HRA to 88 HRA Hardness, Rockwell A Scale, Hardness Calibration Test Block
1-1/2 Inch Long, 2-1/2 Inch Wide, 1/2 Inch High, 1 Piece

Features:

• Standard test blocks provides an easy means of checking your tester’s accuracy
• Periodic testing on a regular basis is recommended
• Comparinga test reading of the block with the hardness number on the test block will indicate wheather or not the instrument needs attention
• A surfece rating of less than 5 micro-inches (CLA), and both test and supporing surfaces flat and parallel prior to being calibrated
• Order the hardness range and scale which is approximately the same as the work you will be testing.
• Approximate sizes: 1-1/2″L x 2-1/2″W x 1/2″H