• Made of polystyrene plastic • +/- 1 mm/m precision in normal position, +/- 1 mm/m in inverted position • Barrel-shaped vials • Vial liquid is resistant to UV light and extreme temperatures • Sensitivity of 10 mm/m • High-visibility • Radius of the vial is 200 mm • Unbreakable vials • 2 lines in each side of flat vial for easier use