3-Dimensional Crack Monitoring Gauges

I came across this interesting product for structural/geotechnical monitoring of cracks in 3 dimensions.  Most crack monitors are designed for monitoring in 2 dimensions, this one can measure movement out of the plane of monitoring.  I like that the markings are laser-etched so the simple device should last for a long time.  Price is $40/each from Quality Plus Engineering, LLC.

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