Pipes can be measured using the measuring reference surface with the V shaped groove ED-MB Type (With magnet) With its magnet, comes convenience in general work applications through is adhesive performance. With its magnet, comes convenience in steel framing work, plant and factory applications. 6-LINE AIR BUBBLE TUBES 1/100 gradient (1min slope) 2/100 (2min slope) measuring Magnifying lens for easier us Being phosphorescent, the device draws on light from well-lit places to emit light for a few minutes in darker applications . Very convenient with its own accuracy adjuster. SPECIFICATIONS Hardened extruded Aluminium alloy lumite clear painted finish 6-line acrylic horizontal air bubble tubes with lenses 6-line acrylic vertical air bubble tubes Magnet (ED-MB) SENSITIVITY / ACCURACY Sensitivity 0.35mm/m=0.0201˚ Accuracy: Within ±1.00mm/m±0.0573˚