Pack of 2 measures with an error tolerance of +/-0.5mm at 1m. 3m blade standout for increased reach and easier measuring. Featuring rugged, shock-absorbing rubber design for excellent impact resistance, Tru-Zero hook for precise inner/outer measurements and durable compression lock technology to lock the blade in place. Tylon-coated blade offers improved durability and wear resistance and the rubber grips to the work surface, making it suitable for roofing and uneven work areas. 28mm blade width. ABS Plastic Case Tylon-Coated Steel Blade Metric & Imperial Scales Class 2 3m Standout Reach Abrasion-Resistant True Zero Hook ABS Plastic Case Tylon-Coated Steel Blade Metric & Imperial Scales Class 2 3m Standout Reach Abrasion-Resistant True Zero Hook