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Safety length is designed to protect the user’s fingers from sharpness of the metal tape during rapid retraction of the measuring tape. Safety length has a protect shield which wraps the metal tape from all sides, shielding the user’s fingers from the sharp edge of the metal tape while limiting its movement. Before use, you just need to pull out the shield and the tape will slides out together. After use, you can push up the slider. Both tape and shield will slide in.
East China University of Science
and Technology
Shanghai, China
Chong Ma,
East China University of Science and Technology
Jin Li,
East China University of Science and Technology
