VW displacemeter SJ-3000, 3010, 3020

VW crack meter is installed on crack of concrete structure surface or connection to measure crack change.
SJ-3000 is composed of sensor part and anchor fixing part.  Both edges of the crack crossing the crack space are
fixed with the anchor bolt. The development of the crack size is transmitted to the sensor part through anchor and body
and when the vibration wire is magnetized by the magnetic coil due to the tensile force changed the vibration wire will
generate the resonant frequency and then this frequency will be transmitted to the output device to display the
engineering unit. Two types of the gauge are available for different measurements, so it is optional depending on
the crack size.  It can be measured semi-permanently using anti-corrosive and rust-resistant materials.