The light absorption sheet absorbs the light at a well-lit area and emits the light at a dark area for several minutes.A measurement of the normal grade can be made with 45°vial.A measurement of a pipe can be made with U-grooved measuring face.Tripple-power strong magnet!IDEAL LEVEL-2 WITH MAGNET(Neodymium magnet) is also available. (ideal for steel-frame work)● ABS resin● Curing treatment of aluminum alloy extrusion material● Coating of anodized aluminum clear● Can measure a pipe● 6-line acrylic vial● With 2 magnetsSensitivity 0.35mm/m=0.0201°Precision ±1.50mm/m=within±0.0859°H50 X W20