This Faithfull specialist level is designed to ensure fence posts are upright prior to fixing. Other uses include plumbing pipes, levelling of RSJ\'s and other applications where a vertical and horizontal is needed. The durable plastic angle plate has 2 acrylic horizontal vials and 1 vertical vial that are accurate to 1.75 mm per 1m = 0.1° . There are 2 fixing methods:1. Elastic strap for non-magnetic surfaces.2. Magnetic base for use on RSJ\'s and steel fence posts. Size: 140 x 90 x 90 mm.