A measurement of the normal grade can be made with 45°vial.A measurement of a pipe can be made with V-grooved measuring face.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● 4-line acrylic vialSensitivity 0.50mm/m=0.0286°Precision ±1.50mm/m=within±0.0859°