Solid aluminium profile with the dimensions 49x23 mm and a weight of approximately 650 g/m, featuring magnets on the underside. Unbreakable block vials with very high transparency and durability. Horizontal vial with a magnifying lens and luminous coating. Vial radius of 200 mm, resulting in a sensitivity of 10 mm/m. Measuring tolerance in normal position is ±0.5 mm/m, with reversal measurement at 0.75 mm/m. The vial liquid is a thin, colored oil mixture that allows the bubble to move optimally. High resistance to UV light and temperature fluctuations.