Powder-coated extruded aluminium construction (1.2mm thick). Milled top and bottom faces for enhanced accuracy. Ribbed sides, protective end caps and hanging hole. Highly visible, UV-resistant 45°, 90° and 180° vials. Accurate to 1mm/m. Powder-coated extruded aluminium construction (1.2mm thick). Milled top and bottom faces for enhanced accuracy. Ribbed sides, protective end caps and hanging hole. Highly visible, UV-resistant 45°, 90° and 180° vials. Accurate to 1mm/m.