I-Beam Level Number of 30 Vials 0 Number of 45 Vials 0 Number of Level Vials 1 Number of Plumb Vials 2 Top Read Top Read Window Vial Illumination None Vial Material Acrylic Features Pipe Groove Enables Use on Rounded Surfaces Shock-Absorbing End Caps Hold Up to Heavy Use Number of Hand Grips 2 Number of V-Grooves 0 Magnet Type Not Applicable Number of Magnets 0 Accuracy - Standard 0.0015 in Frame Material Aluminum Overall Height 1 in Overall Length 48 in Overall Width 2 1/4 in