Professional Measuring Tape AUTO-LOCK
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The brake principle:
Adopting rolling-wheel theorem makes wheeling automatically when the blade extent and retract. The strengthened POM (central pillar) , TPR(stop-control wheel) materials enhance the stop, pause functioned efficiently and secure the scale calibration won't be damaged.
Auto-stop works at any length any time, and the retract impact could be buffered efficiently. Single button design is handy and easy work.