Aluminum profile with flat milled measuring sides (does not apply to 1800 mm). The base with V-shaped groove enables precision measurement on pipes. Rubberized shock absorbing end covers. 2 ergonomic handles (one handle on 600 mm). 3 solid acrylic shockproof vials with high transparency. one vial with magnifying glass. A vertical vial with DualView ™ which allows it to be read even from the front. Tolerance in normal position ± 0.5 mm / m, up and down ± 0.5 mm / m. Resistant to ultraviolet light and temperature changes. The bubble is not affected by static electricity.