David White AL8-26 26X Automatic Optical Level.
Magnification: 26x magnification power for medium-range leveling tasks. Accuracy: Features a leveling accuracy of \(\mathbf{\pm 1/16}^{\mathbf{\prime \prime }}\) at \(\mathbf{100}^{\mathbf{\prime }}\) (\(\mathbf{\pm 1.6}\text{\ mm}\) at \(\mathbf{30}\text{\ m}\)). Technology: Utilizes a wire-hung, magnetically dampened compensator to hold the line of sight within \(\mathbf{\pm 15}\) arc minutes of level.