A measurement of a pipe can be made with V-grooved measuring face.Angles of main unit are 45°･60°･120°･135°so this can be used as a stop ruler. (A stop ruler is a convenient tool when making alignment of 45°or scribing lines in construction.)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 of fluorescent color● Can measure a pipe● With 1 magnet● 4-line acrylic vialSensitivity 0.50mm/m=0.0286°Precision ±2.50mm/m=within±0.1432°