Durable, accurate and ergonomic design of this box level is a jobsite essential. Its reinforced aerospace aluminum alloy frame provides the durability needed on even the roughest jobsite, while the magnified domed vials provide 320 deg visibility and feature Johnson’s patented Glo-View technology, so they glow in the dark to maximize vial readability.Patented Glo-View recharges the vial surrounds from light sources for easy read in low lightDomed level vial offers 320 deg visibilityLarge comfortable rubberized hand gripsReinforced aerospace aluminum alloy frameRemovable end caps designed for finish carpentry work when measuring into cornersGripTight non-slip end caps hold level firmly in place with just one hand