![SPI - 30 HA to 90 HA Hardness, Shore A Scale, Hardness Calibration Test Block Kit - 2 Inch Long, 2 Inch Wide, 0.285 Inch High, 7 Piece - Exact Industrial Supply](http://exactindustrialsupply.com/cdn/shop/products/5964770-23_1024x1024.jpg?v=1586020858)
SPI - 30 HA to 90 HA Hardness, Shore A Scale, Hardness Calibration Test Block Kit - 2 Inch Long, 2 Inch Wide, 0.285 Inch High, 7 Piece
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