Maintain accuracy and experience ease of use with height reading at eye level. Built-in extensions lock into place with ease and its attachable bulls eye level ensures that the pole remains completely vertical. 630 Telescopic Aluminum Ruler - Metric Graduation 3m At Kapro, we reimagine precision tools and accessories for professional craftsmen to weekend warriors while setting high standards by driving innovation in our designs.The Kapro 630 Telescopic Ruler features a printed scale accurate to 0.