Stanley Tools PRO-180 I-Beam Level has a durable, I-beam girder section aluminium body for strength and long life. All levels feature 1 x top read horizontal vial, 1 x 180° rotating angle vial (double graduation for 0° up to 90° and in 10° increments), plus levels above 40cm include 1 x plumb vial. The horizontal vial can be viewed from both sides and above for ease of use. Shock absorbing end caps protect the accuracy of the level if accidentally dropped Accurate to ± 1.5mm/1m.