Master Precision Level Overall Height 3 3/4 in Overall Length 15 in Overall Width 2 in Number of V-Grooves 0 Number of Level Vials 2 Number of Plumb Vials 0 Number of Cross Test Vials 1 Features Specially Designed to Set Up Ground and Graduated Main Vial Auxiliary Level Vial Shows Lateral Position and Assists In Horizontal Setting Level Vials are Positioned so Breakage is Reduced to A Minimum Non Conductive Top Plate Total Number of Vials 2 Sensitivity 0.0005 in/ft