Crackmeters and jointmeters are used to monitor movement across surface cracks and joints in concrete, rock, soil and other structures. The device is essentially a linear displacement transducer with anchors and ball joints. Depending on your application, you may choose between sensors that use electrical or vibrating wire sensing technologies.
The device is typically installed by grouting the two anchors in drill holes on either side of the crack or joint. When the crack or joint opens or closes, the movements will be converted into electrical or frequency signals that can be read with a readout unit or datalogger.