RoboToolz RT-2350-20 Transit Level Magnification: 20x - Level Vial: 10 minutes per 2mm Accuracy: +/- 1/4 @ 100' Range: 200' - Minimum Focus: 4' Field of View: 2' @ 100' - No. of Lenses: 6 Vertical Arc: 0-45 degrees, 1 degree graduations