Sturdy, silver anodized, extruded aluminum I-beam frame with shock-absorbing, protective end-caps and barrel vials that fit into precision-stamped cutouts and are held in place by Quick-Change ABS plastic vial covers for easy replacement. Clear acrylic lenses protect vials. Rule screen-printed on one leveling surface, calibrated in 16ths on one edge and centimeters on the other. 1" x 2-1/8" frame.
