Expert Quality Plus with front viewing Plumb Site® Dual View vials. Aluminium box section extrusion with milled top & base (except 1800mm), electrostatically powder coated incorporating Keflon anti-stick additive & baked with polyester acrylic paint. Two Ergo Grip nonslip soft grip handles (one on 600mm), air-cushioned end caps, one horizontal vial (1800mm has two) & two vertical vials, plus two Plumb Site® Dual View viewing vials. Accuracy 0.5mm per 1M = 0.029° in standard position. Manufactured for Draper Tools by Kapro. Sold loose with display hanger.