Three 12mm diameter vials for levelling at varying angles (180°,90°, 45°), Top window for clear and effortless vial reading even from above, Integrated vials are encased in rugged, oversized plastic end caps, affording excellent protection and sustaining the vials’ accuracy, Continuous edge on both sides, enabling the products to be used as a ruler for marking up, Precise levelling performance with 2.0mm/m accuracy on all working edges. Yellow powder coating has been added to the levels for extra surface protection, Hang hole for storage.