哑铃厚度测量
ＵＬ１５８１中有规定的：在标志线处，标志线内６ＭＭ及１９ＭＭ处共测试４点取最小值－－440.24 The thickness of the specimen is to be taken as the smallest of four measurements to 0.001 inchor 0.01 mm, two of which are to be made at 1/2-inch or 13-mm intervals between the bench marks on oneedge beginning 1/4 inch or 6 mm from either mark, with the other two measurements being made at corresponding points on the opposite edge.
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