12" precision machinists' spirit level with a main vial and a cross-test vial for determining horizontal plane and a plumb vial for determining vertical plane
Graduated, ground glass main vial has a sensitivity of 0.42 mm/m or 80 to 90 seconds and is adjustable to a positive setting for accurate results
Cross-test vial enables simultaneous leveling in two directions
V-shaped groove along the base provides reliable seating when leveling round items
Cast iron base for durability and finished wood case for storage
Cross test vial allows simultaneous leveling in both directions. Plumb vial is adjustable