Rugged, aircraft grade aluminium Heavy-duty construction, aluminium wall thickness 1.7-2.6mm Wide frame design, reinforced box-beam construction for durability & accuracy Powdercoated aluminium surface will not rust Large 180¡ vial bubbles reduce reading errors Shockproof acrylic block-vials provide maximum accuracy of 0.0005/inch (0.5mm/m) Oversized rubber grips for comfort handling Removable, shock absorbing rubber ends prevent damage to finished edges Precision machined top & bottom surfaces Available in 600mm and 1200mm