This Tell-Tale Crack Monitor features a precision gauge with overlapping plates—one calibrated in millimeters and a transparent top plate with a crosshair cursor for accuracy. It comes with complete installation instructions, a Crack Record Sheet, and fixings. It measures horizontal movements up to ±20 mm and vertical movements up to ±10 mm. The redesigned fixing column secures the plates without glue, and the high-quality polymer construction ensures durability and easy readability. Perfect for monitoring wall cracks over time.