Gilson HM-641 Concrete Crack Caliper Marks (100 Pack)


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Gilson HM-641 Concrete Crack Caliper Marks (100 Pack)

Crack Monitoring Discs are used for accurately monitoring concrete crack movements in concrete structures and provide a solid reference point to ensure consistent and accurate measurements each time.

Small cavities in the center of each disc are used to precisely locate the jaws of the TSA-271 Digital Caliper for accurate and reliable monitoring measurements. Discs can also be attached easily to either side of the crack using HMA-804 Rapid-Set Epoxy or used with Concrete Crack Monitors in measuring and monitoring. Available in packages of 100.

HM-640 Monitoring Discs are constructed of stainless steel.

HM-641 Monitoring Discs are constructed of polycarbonate plastic.


  • Fast, simple installation
  • Easy and precise monitoring

Crack Monitoring Record SheetCrack Monitoring Record Sheet

Full Line of Concrete Crack Monitoring Equipment

Certified Material Testing Products provides Concrete Crack Monitors as part of a complete line of concrete testing equipment for roads, bridges, and foundations. Need a vandal-resistant monitor?  The Concrete Crack Monitor Plus is the perfect choice for vandal-resistant in the field. The Economy Crack Comparator is ideal for concrete cracks measurements and monitoring. The Concrete Crack Width Gauge is designed specifically to measure widths and locations of cracks prior to beginning a monitoring program. The Concrete Crack Displacement Monitor is used for measuring horizontal and displacement movement where there is a step across a crack due to a displacement of "out-of-plane" movement.

Gilson HM-641 Concrete Crack Caliper Marks (100 Pack)

Gilson HM-641 Concrete Crack Caliper Marks (100 Pack)