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I have a problem as to which is the correct alignment gauge to use.One is based on the metric system and the null points are 66 and 120.9 mm respectively.The other gauge uses the Imperial system of measurement and the null points are given as 2.6 and 4.76 inches.Now this last set of figures translates into 66.04 and 120.904 mm.So which is the more accurate gauge based on the Baerwald system,as both gauges seem to be approximating this?