Joint & Crack Meters - Measure Displacement of Adjacent Surfaces

Crack meters are designed to measure displacements across cracks and joints typically in buildings, bridges, dams, pipelines and rock formations

Fracture mechanics - Wikipedia

Joints - Crackmeters - Soil Instruments

Fracture toughness - Wikipedia

Electrical Crackmeters and Jointmeters - Sisgeo

Joints - Crackmeters - Soil Instruments

Concrete crack detection through full-field displacement and curvature measurements by visual mark tracking: A proof-of-concept study - Zhaozheng Yin, Chenglin Wu, Genda Chen, 2014

Displacement, Crack meter, Joint meter – GDS

Electrical Crackmeters and Jointmeters - Sisgeo

Displacement, Crack meter, Joint meter – GDS

Evolution of Tiling-like Crack Patterns in Maturing Columnar Joints

Joint Meters - Geodata

Concrete Crack Displacement Monitor

Gilson Crack Monitors