| 摘要 |
A wrench includes a pipe, a lever, a first wedge, a second wedge, an elastic element, a counter and a sensor. The lever includes a portion put in and pivotally connected with the pipe. The first wedge is attached to the portion of the lever. The second wedge is in contact with the first wedge. The elastic element biases the second wedge against the first wedge. The counter is installed on the pipe. The sensor signals the counter every time it senses movement of the first wedge past the second wedge.
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