A measurement of a pipe can be made with V-grooved measuring face.A measurement of the normal grade can be made with 45°vial.The light absorption sheet absorbs the light at a well-lit area and emits the light at a dark area for several minutes.Ideal for steel-frame work with magnet.● Curing treatment of aluminum alloy extrusion material● ABS resin cover● With 1 magnet● 4-line acrylic vial● Can measure a pipeSensitivity 0.50mm/m=0.0286°Precision ±2.50mm/m=within±0.1432°