Torpedo Level, Professional Grade. Four open vial ports for easy viewing from all sides. Perfect for pipe and conduit work. Four rare earth magnets allow for hands-free use on metal surfaces. Four vial design - 0°, 30°, 45°, and 90°. Machined from aluminum alloy and anodized to aircraft standards. V-groove on bottom for mounting on curved surface. Offsets and calculations permanently laser-engraved onto level.