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 a pipe can be made with V-grooved.● Three gradients and the horizontal can be measured in one vial. ● It became easy for the lens to adhere, and to see. SLOPE LEVEL WITH MAGNET is also available. (ideal for steel-frame work)● Curing treatment of aluminum alloy extrusion material● Coating of anodized aluminum clear and anodized aluminum polyester powder● Measurements of 3 gradients can be made.● With 2 magnets *1 magnet for ED-10SLMN● 3-gradient acrylic horizontal vial with lens● 4-line acrylic vertical vial(Horizontal vial)Sensitivity 0.15mm/m=0.0086°Precision ±0.45mm/m=within±0.0258°(Vertical vial)Sensitivity 0.50mm/m=0.0286°Precision ±1.50mm/m=within±0.0859°H51 X W19.5