3 tubular vials: 1 top read level vial, 1 plumb vial and 1 180 rotating angle vial (double graduation for 0 up to 90 and in 10 increments)|Accuracy of +/- 1.5mm/m|Available in 400mm, 600mm, 800mm, 1000mm, 1200mm,|Durable I beam girder section aluminium body for strength & long life|I beam profile|Shock absorbing end caps protect the accuracy of the level if accidentally dropped