For the measurements of deflection and arrows remaining in building construction in masonry or metal. Constituent elements of each set of measure: 3 stainless steel wire inextensible m 20. 3 adjustable brackets for the comparators. 3 grams of lead 200. 3 digital comparators reading 1 / 100 mm with maximum storage arrow deflection. 3 auction runs from 150 + 150 mm with clamp light 40 x 25 mm for fixing pipes or beams. Used both in traction and pressure. Complete with instruction sheet. Pack a suitcase.