The Model 4400 Embedment Jointmeter is designed for use across construction joints, such as those between adjacent blocks in a concrete dam. It is normally embedded across the joint to monitor the expansion or contraction of the joint. The use of internal universal joints allows for a degree of shearing motion.
Datasheet
The Vibrating Wire Triaxial Jointmeter is specially designed for measuring the relative displacement of two adjacent surfaces in three orthogonal directions.
Datasheet