Abstract: A sensor system for substantially simultaneously measuring and detecting the verticality or perpendicularity of the forklift vehicle mast and the vertical height displacement of the forks. The sensor system then alerting the operator of the satisfactory assessment of the precondition alignment of the forks so that, without the need for visual checking of the vertical positioning of the forks, the operator can insert the forks under the pallet load support surface and lift the load without causing damage to either the pallet or the load.