| 摘要 |
PURPOSE: A measuring device is provided to maximize productivity and energy efficiency by informing an operator of the depth of an inner diameter, an outer diameter and an inner diameter with only one measurement and by being easily installed. CONSTITUTION: A mother ruler having scales regularly carved is seen to be amplified by a convex lens(18) with 0 to 10 of a measuring scale carved on an upper oblique side(14-a) of a measuring unit(14). The measuring unit is moved by a handle(11). When the handle rotates, the measuring unit moves to the right and the left from a fixing unit. It means that the sun ruler moves by a measure in the scale of the mother ruler installed in a moving unit(15).
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