Stanley classic box levels stanley stht1 43108 the stanley classic box levels have a strong construction to withstand demands of the worksite their soft end caps add durability and resistance to shockthe levels have a block magnified central vial to make reading easier in addition they have a large tubular side vial for vertical measurementsaccuracy 05mmmlength 180cm stanley stht1 43108 classic box level 3 vial 180cm