California’s Proposition 65 entitles California consumers to special warnings for products that contain chemicals known to the state of California to cause cancer, birth defects or other reproductive harm if consumers are exposed to these chemicals above certain limits. Products linked to this page contain chemicals known to cause cancer, birth defects or reproductive harm.
Used to monitor the movement of cracks and joints in concrete, brick or cement block structures. The monitor consists of two plastic plates: one white with a black grid graduated in millimeters, the other clear with red cross-hairs centered over the grid zero lines. Maximum crack width 3/4 in (20 mm). Maximum upward movement 3/8 in (10 mm).