| 摘要 |
A hand-held portable length probe having a length measuring wheel and a tracing unit disposed adjacent the measuring wheel, the tracing unit being slidably carried by the probe housing and acting to actuate a switch secured in fixed relation on the probe housing. The switch is illustrated as a miniature snap action switch, actuated by the slidable tracing unit either directly or indirectly through an intermediate adjustable spring lever arm; and is also illustrated as a magnetically actuated switch in the form of a reed switch which is actuated by a permanent magnet carried by the sliding tracing unit. The wheel is carried in a removable nose element which serves to aid in anchoring the tracing unit housing to the length probe main housing. The switch is carried, in the illustrative examples, by a retention clip.
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