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.Easy to measure of the vertical of a pillar and a pipe.● Curing treatment of aluminum alloy extrusion material● 4-line acrylic vial● A measurement of a pipe can be made● ABS resin cover● Measurements of 5 gradients, the horizontal, and the vertical can be made.Sensitivity 0.50mm/m=0.0286° Precision ±2.50mm/m=within±0.1432°H51 X W19.5