Precision Step Gauge for Caliper Checking:
FEATURES
Precision step gauge block for calibrating various application measurements including dial calipers, digital calipers and height gauge and the like.
Range Permissible Error
300mm ±0.0020mm
(http://www.anyimeasuring.com/images/product/step-gauge-caliper-checking.jpg)
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--Unconditional Replacement and Refund Guaranteed