Precise crack assessment: concrete crack monitoring gauge with a millimeter scale and central grid for easy alignment; transparent design; making it simple to track concrete crack propagation; Versatile corner application: this monitoring gauge fits various wall corners; spanning a measurement range of -20 mm to +20 mm; an essential element to check cracks; Professional building tool: tailored for construction; a professional choice for checking structural integrity; helping to maintain structural assessment; Simple to install: comes with slots and screws to promote secure installation; thereby ensuring stable, and dependable monitoring; eliminating shifting-related inaccuracies; Durable acrylic build: crafted with high-end acrylic for reliability and long-term use; it is designed with four rounded corner holes, prioritizing user-friendliness

What's in the box
1 x Measuring Scales