Spirit Level Aluminium SM - Hultafors Aluminium profile measuring 49x21 mm and weighing 520 g/m. Crush-proof block vials that are highly transparent and durable. The radius of the vial is 200 mm, giving a sensitivity of 10 mm/m Tolerance in normal position is ±0.75 mm/m, upside down ±1.0 mm/m The liquid in the vial is a low viscosity coloured oil mixture that gives the bubble optimal freedom of movement Highly resistant to ultraviolet light and temperature fluctuations The anti-static properties of the liquid means that the bubble is not affected by static electricity Read more