strainmeter

A strainmeter is an instrument used by geophysicists to measure the deformation of the Earth.

Most strainmeter records show signals from the earth tides, and seismic waves from earthquakes.

Gage Technique's vibrating wire rebar strainmeter, commonly known as a "sister bar", is designed to measure strains in mass concrete.

Operation The soil strainmeter employs a potentiometer and a rod mounted between two anchors to monitor horizontal movements of the surrounding soil.