The STANLEY 10m/30' Powerlock Tape has been designed with Class II accuracy ensuring readings shown are accurate and precise. The Tru zero end hook moves accordingly to compensate for accurate inside and outside measurements. The Blade Armor is an additional material that is added to the first 3 inches of the tape. This is the area that is most susceptible to blade damage, reducing the risk of breaking the blade by 95%. The Mylar coated blade is up to 10 times more resistant to abrasion than nor