Worker is calibrating to vernier caliper with gauge block. Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. Photos
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Gauge block testing. Gauge blocks (also called Johansson gauges, slip gauges, or Jo blocks) are metal measuring standards that are used as references Stock Photo - Alamy
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Worker is showing gauge blocks. Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. Photos | Adobe Stock