CRACKMON 4020A Heavy-Duty Building Foundation Crack Monitor for Concrete, Masonry and Stucco Contains (1) CRACKMON 4020A heavy-duty crack monitor, instructions, and crack progress chart Engineered polymer with vibrant measurement grid includes new polar magnitude measurement 20 mm (0.79") horizontal and 10 mm (0.38") vertical range Unique CRACKMON serial ID for engineering and forensic traceability Designed and made in the USA. Epoxy and fasteners sold separately.