Tape measure theory:
 Tape because the tape can be rolled up inside the spring-loaded, tailor tape measure pull out the measuring in length, the actual scale and the

spring is stretched the length, once the measurement is completed, the spring inside the tape will automatically shrink the

role of scale in the spring force also followed under contraction, so the tape will be rolled up.
 Tape measure features:
 A tape measure will not fail too much distortion. Why did not fail; horse weight tape in the spring is very long, it's completely

relaxed to fully tighten the range of large, measuring tape measuring tape
 All trips include one, two are left margin, so the tape will not fail.
 Second, pull a meter long and two meters long pull, pull no difference; tape of winding thin, tightening when the

deformation is small, so the reaction is very small, when they feel the pull force size changes.
 Tape measure use:
 Promotional gifts for advertising purposes feet, divided into the steel tape (strip) and skin tape (PVC plastic fiber-foot

zone) is usually relatively small and adorable. bra measuring tape also known as the world's 85 percent of tape are exported

from China.