Goldblatt 48in. Double View Vertical Site I-box Spirit Level Patented Verti-siteTM Vial design vial can be read from side in confined space, Double view vial Central magnified vials, UV protection finish for colour fading resistant 6061 aircraft-grade aluminum, machined top and bottom surfaces High Accuracy: 0.029 Rubberized end caps protect against shock, comfort grips for ease of handling