It is a light weight construction and can be separated into two parts for easy transportation. The principle is that a long beam resting on road surface at one end and balanced at a point to give a ratio of 2:1 will magnify a small deflection caused by loading adjacent to the end of the beam in contact with the road, By using a stable platform adjacent to the other end of the beam this small movement can be measured accurately compete with dial gauge 0.01 mm 25mm
