The digital length comparator measures the length changes of hardened cement paste, mortar and concrete prismatic specimens.  The indicator mounts on a sturdy cross-bar support that attaches to solid posts.

The unit fits gauge studs, that cast into test specimens. In addition, it includes an invar reference bar.  The length comparator accommodates test specimens that have a 4″ x 4″ cross section or smaller.

• Mounts on a sturdy cross-bar support
• Cross-bar support attaches to solid posts
• Includes invar reference bar
• Accommodates max samples with a 4″ x 4″ cross section