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.