Featuring a built-in auto 45-degree angle for quick referencing and perfect alignment, the Ultra Mag G3 has a 4-vial system with 90°, 45°, 30-Degree and oversized 0-Degree reading for easy viewing from oversized view ports that can be seen on all sides simultaneously for more sensitive flat surface calibration. Four oversized rare earth neodymium magnets supply extraordinary holding power. Our V-Groove System lets the Ultra Mag G3 to straddle almost any pipe up to 10 inches in diameter.