Bihui aluminium spirit levels 
Accuracy: 0.5mm/m (0.0005in/in)
Finely milled surface for higher accuracy
Shockproof rubber end caps
Comfortable rubber handle
Magnified horizontal vial for a clear view of the bubble
3 Solid acrylic shockproof vials 45°, 90°, 180°
Available sises:
600mm, 1200mm, 1800mm, 2400mm