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• 00:37, 6 December 2022 Grichards talk contribs created page Extensometers (Created page with "__NOTOC__ Category:Movement Surveillance and Monitoring ---- Borehole extensometers (single-point or multi-point) are instruments designed to measure axial displacement of a fixed point or points along its length. Extensometers can be a rod-type, or a wire-type and are usually grouted into an uncased borehole. They can be installed horizontally, vertically, or at any angle.<ref name="Glossary">Federal Guidelines for Dam Safety: Glossary of Terms (FEMA P-148)| Fede...")