Robust body made of die-cast aluminum; Impact proof block vials made of acrylic; Accuracy: +/- 0.5 mm / m - for accurate measurements and accurate reading; Two angle with rotatable Dragonfly (90 ° / 90 °); Strong Rare earth; Enlarged dragonflies; groove in the measurement area - ideal for curved surfaces. 3 vials, accuracy 0.5 mm/m