SECTION NINE. GAUGES 40a. The gauges illustrated in figures 2, 3, 4 and 5 shall be considered to comply with the dimensional requirements if the results of the measured values are within the specified dimensions and the uncertainty of measurement at not less than 95% confidence level does not exceed ±0.0002in/0.005mm. 41.‘Go’gauge for plug (see Fig. 3 and Table 20). The gauge is to prove corr...