Pipes can be measured using the measuring reference surface with the V shaped groove. A shackle for hang on tool.The light absorption sheet absorbs the light at a well-lit area and emits the light at a dark area for several minutes.Tripple-power strong magnet!Ideal for steel-frame work with magnet(Neodymium magnet)● Curing treatment of aluminum alloy extrusion material● Coating anodized aluminum clear● Can measure a pipe● One magnet● 4-line acrylic vialSensitivity 0.50mm/m=0.0286°Precision ±1.00mm/m=within±0.0573°