This Stanley Tylon&tradePocket Tape has a corrosion resistant, long-life Tylon&trade coated blade with positive blade lock for accurate measurements. It displays both metric and imperial graduations. Fitted with a Tru-zero hook, which compensates accurately for internal and external measurements, with triple rivet construction for greater strength and durability. The impact resistant ABS plastic case is fitted with an ergonomic overmould for all day comfort.