Great choice in dark spaces! Lightweight aircraft aluminum frame Ribbed extrusion for strength Frame will not warp or twist Precision milled for accuracy LEDs light up acrylic vials for high visibility Magnified top-reading level vial Accurate to .0005 In. per inch Bright yellow vials are easy to read Durable acrylic vials 3 total vials 1 level vial, 2 plumb vials Magnetic edge works on metal frames Contoured hand holes Shock absorbent end caps Hang hole for easy storage Uses 2 AA batteries, not included *Does not fit in Sands Level Cases