Powder-coated extruded aluminium construction (0.8mm thick) with highly visible, UV-resistant 45°, 90° & 180° vials. Features protective end covers and hanging holes for storage. Accurate to 1mm/m. Made from 50 x 20mm thick box section aluminium with 3 horizontal and vertical vials and black plastic end caps. Manufactured from aluminium with protective end caps 45?, 90? and 180? vials Hanging holes for storage 50 x 20mm box section.