The Lacroix deflectograph consists of the following components:
- A two-axle lorry with a minimum wheelbase of 6,800 mm, the rear axle being twinned and able to carry a load of 13 tonnes.
- A reference beam equipped with two probe arms.
- A system of traction and guidance of the beam with electronic control ensuring safety against the crushing of the ends of the beam.
- An operator station allowing the piloting of the system by a computer and its dedicated software.