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Check the listing for details. Crack Monitor Precise Read Measurement Grid Concrete Crack Monitoring Record. Condition: New. Listed at 14.17 USD. It is practical for you. Crack Gauge Monitor is made of high-quality acrylic material, so it is durable, sturdy, smooth, wear-resistant, and not easy to break. Durable and Sturdy: Crack Gauge Monitor is made of high-quality acrylic material, which is durable, sturdy, smooth, wear-resistant, and not easy to break.