Electric and electronic measuring devices and apparatus for detecting and monitoring electric current and electrical signals; distance and size measuring instruments and apparatus, namely, laser rangefinders, angle measuring devices, inclinometers; electronic sensors and detectors, namely, electroacoustic ultrasound sensors, laser sensors, microwave sensors, radar and radar sensors, sensor and detectors for determining temperature, position, gradient, warehouse capacity, flatness, layer thickness, distance travelled, or speed; distance and spacing measuring apparatus for controlling construction machines, in particular electroacoustic ultrasound sensors, laser sensors, microwave sensors, radar and radar sensors; measuring devices for measuring width for use in road pavers, road-milling machines, and compactors; Electrical integrated levelling system; electronic control system; and electronic regulating system; for use in the field of construction machines and road-building machines; Downloadable computer operating software for use with construction machines for levelling, controlling and regulating system; for road-building; apparatus, instruments and cables for electricity, in particular cables or cable connections for treasuring devices and apparatus, distance and spacing measuring apparatus or components of levelling, controlling and regulating systems; adjusted holders specially adapted for measuring devices and apparatus, in particular mechanically adjusted and adjustable holders on construction machines and carriers for measuring devices and apparatus, distance and spacing measuring apparatus or components of levelling, controlling and regulating systems; parts, spare parts and accessories specially adapted for all the aforesaid goods