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Amazon.com: 5-step Calibration Block for Ultrasonic Thickness Gauge 0.1"-0.2"-0.3"-0.4"-0.5" : Industrial & Scientific
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4-Step Calibration Block for Ultrasonic Thickness Gauge 0.1'' 0.2'' 0.4'' 0.6'' w/1018 Steel: Amazon.com: Industrial & Scientific
YUSHI 5-Step Calibration Block 0.100"- 0.500" for Ultrasonic Thickness Gauge | Fabricating and Metalworking
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REED Instruments - Thickness Gage Accessories; Type: 5 Step Block; For Use With: Ultrasonic Thickness Gage - 10166957 - MSC Industrial Supply
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1 Set Of 32pcs Precision Gage Blocks, Air Gap & Thickness Gauges, Single Leaf Calibration Feeler Gauge | SHEIN
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