本試驗裝置為桌上型, 符合UL 2556標準要求。適用於檢測電線絕緣體和被覆體的啞鈴狀試片厚度。
測量范圍：0.01～10mm,最小分度:0.01mm。（日本三豐百分表）
荷重砝碼：85±3g
試樣測頭：ø6.4±0.2mm
下 測 帖：2×9mm
大理石臺座：150×200mmm
試驗方法
1、松開大理石臺座固定旋鈕，調整上下高度使百分表的指針指到零位。
2、取啞鈴狀被測樣品，按下百分表的提升桿，將樣品放在6.4mm測頭
下，放下提升桿，直接讀取百分表的數值。即被測樣品的絕緣厚度。
UL 2556標準參考
4.2 Physical properties (ultimate elongation and tensile strength)
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
exerting a total force of 0.83±0.03 N (3.0±0.1 ozf) on a rectangular anvil measuring
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be slightly convex. Alternatively, these measurements shall be made with a dead-weight dial micrometer having a presser foot 6.4±0.2 mm(0.248±0.010 in) in diameter and exerting a total of 85±3 gf or 0.83±0.03 N (3.0±0.1 ozf) on the specimen – the load being applied by means of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
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