Keterangan :

Travelling beam device

Used to measure planeness of pavement or concrete surface, such as highways,
airport roadways, bridge decks, etc.
The apparatus consists essentially of a beam with rigid wheels at the extriemilities
of a wheel at the middle, which can detect any vertical deviation of the
surface from a straight-line between the two wheels at the end of the machine.
A sensing unit comprising a wheel connected to an indicator provides a
magnification of 4: 1 deviation of the surface from straight-line is shown on a scale
calibrated in increments of 2mm to 10mm and 5mm up to 25mm.
Outtigger wheels provide mobility for on site use and the device is supplied as
three sub assemblies which can be quickly assembled for ease of transportation.