| 摘要 |
A tool for measuring perimeters or circumferences of, for example, optical lenses. A base carries a measuring tape fixed at one end to the base and connected at its opposite end to a movable handle. The portion of the tape intermediate its ends forms a variable-dimension loop within which the item to be measured is placed. Movement of the handle in one direction tightens the loop about the item and the size is read on dimensional markings on the tape. The tool is designed to be hand-held and the handle is biased in such direction as to increase the size of the loop so as to render easier the placement of the item to be measured within the loop. The base, in an area substantially in register with the loop, has a cushion for receiving the item to be measured in non-slip fashion.
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