[Features] ●The V-shaped measurement surface is equipped with a magnet so that it can be easily installed on pipes. ● Both ends have protective rubber with excellent impact resistance. - Comes with a carabiner that is convenient for attaching and detaching to a waist bag. ●It is an I (eye) type monocoque frame that is difficult to deform. ●The vial has a high accuracy of ±1.00mm/m.