ASTM E797 NDT Stainless 4 Step Test Block
                                         
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                                            ... Ultrasonic thickness gauge Thickness and linearity calibration. There are eight versions of the block available. In accordance with ASTM E797 The 4-Step block Metric version S-4-MM come in thickness of 3mm, 5mm, 10mm, 15mm. Step Face measures 20mm x ......                                         
                                        
                                            TMTeck Instrument Co., Ltd
                                         
                                        
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