Gilson Concrete Crack Monitors

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HM-637 Standard Crack Monitor is a simpler design with a range of 20mm horizontally and 10mm vertically. The overlapping upper plate is transparent and marked with a red crosshair cursor. The white bottom plate measuring grid is marked in millimeters. There are no spigots for use with calipers. Readability is 1mm.

HM-634 Plus Crack Monitor is vandal-resistant clear polycarbonate with adjustment slots for screws ensure secure placement. After affixing, temporary pegs are removed so plates move independently. Spigots on both plates enable exact measurement to 0.1mm with calipers. (Gilson recommends TSA-271 Digital Caliper.) A second Crack Monitor may be positioned for monitoring in three dimensions.

HM-635 Corner Adapter enables Crack Monitors to be used in corners with greater or less than 90˚ angles.

HM-636 Crack Width Gauge assists those who survey and report on damaged buildings. This durable acrylic Gauge is scaled to measure cracks up to 7mm and wider in corners and awkward locations.

Economy Crack Comparator is a handy, credit card-sized field reference that slips easily into your pocket or wallet. Clear plastic card is marked with inch and metric scales as well as a range of common crack sizes.

HM-638 Displacement Monitor measures out-of-place movement across a crack, such as settling of a floor slab. It also measures opening and closing of the crack itself. Displacement range is 110mm. Horizontal range is -10—+50mm.

The Scratch-A-Track Motion Monitor provides a clear, continuous graphic record of total relative movement of adjacent surfaces. Whether it is mounted over a crack, joint or other void, the Monitor tracks thermal movement, structural settlement, load-induced deflections, or any other change in relative positioning. The unit is small, lightweight, inexpensive and weather resistant.

The plastic single-use Recording Pad has a target area coated with a white film and convenient blanks to record written data such as date, location, etc. The Pad is bonded to one surface using super-glue or epoxy (not included). The nickel coated spring steel Finger assembly is then bonded to the opposing surface and adjusted with a thumb screw so that the stainless steel Scriber moves over the surface of the Pad, it leaves a thin, well-defined black scratch to permanently record its movement. Finger and Scriber assembly may be used over and over.

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