Thickness and linearity calibration. This 4-Step block is themetric "A" version. NOTE: Variations of this block are available ifadditional steps are preferred. Also, larger step faces are offeredfor use with large diameter transducers. In accordance with ASTME797.

• Free aluminium storage case
• 6.25, 12.5, 18.75 and 25 mm steps.
• Made of carbon steel ,other alloy available .
• Delivery cost not inc