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Moulded from polystyrene with a magnetic strip in the base. Unbreakable all-round reading horizontal, vertical and 45° vials. Incorporates a V groove in the top and a hang hole. Accuracy 1.75mm per 1M = 0.1° in standard position. Features and Benefits • Polystyrene with magnetic strip in base • Unbreakable all-round reading horizontal, vertical and 45° vials • Incorporates a V groove in the top and a hang hole Contents 1 x Boat Spirit with Magnetic Base, 230mm