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EMA-11 measuring anchor, also known as rock bolt extensometer, is used to determine load exerted on rock bolts. It is a precision instrument designed to evaluate anchor system forces and their distribution within the length of the bolt and hence its safety and effectiveness.


A digital caliper/micrometer depth gage with a resolution of 0.01 mm is used to take readings. An electrical head assembly consisting of four potentiometric sensors is optionally available for electrical output.

Rock Bolt Extensometer EMA-11

  • • Reliable, accurate and simple to read.

    • Suitable for remote reading of displacement.

    • Probe is robust, care being given to protect all components and sub-assemblies from ingress of water and corrosion.

    • Range upto 100 mm of displacement.

    • Easy to install. • Reasonably priced

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