Master Level Overall Height 3 1/8 in Overall Length 2 9/16 in Overall Width 11/16 in Number of Level Vials 1 Number of Plumb Vials 0 Number of Cross Test Vials 1 Total Number of Vials 2 Sensitivity 0.1 mm/m Frame Material Cast Iron Accuracy 0.1 mm/m Number of Mounting Holes 2 Standards DIN 877 Vial Material Acrylic Vial Shape T-Shaped