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Foreword 0 1 Scope 0 2 Normative references 0 3 General conditions 0 4 Direct verification 0 4.1 General 0 4.2 Calibration parameters 0 4.3 Verification of mass and geometry of impact body 0 4.4 Verification of geometry and hardness of indenter ball 0 4.5 Verification of geometry of support ring 0 4.6 Verification of impact velocity 0 4.7 Indirect verification of instrument 0 5 Indirect verification 0 5.1 General 0 5.2 Procedure 0 5.3 Variation coefficient (V) 0 5.4 Error of test instrument 0 5.5 Measurement uncertainty 0 6 Intervals between verifications 0 7 Verification report/calibration certificate 0 Annex A (informative) Measurement uncertainty of calibration results of Leeb hardness testing instrument 0 Annex B (informative) Direct verification of single coil instrument 0 Bibliography 0

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