Feature:1. FEATURES: Consists of two plates with overlapping partial lengths. The bottom plate is calibrated in millimeters and the top plate is transparent and marked with a crosshair cursor.2. SCALE: Has a 1 mm (0.04 in) scale on the XY axis with a resolution of 0.5 mm (0.02 in). Horizontal range is 20 mm (0.79 inches) and vertical range is 10 mm (0.38 inches).3. EASY TO USE: The redesigned mounting post easily secures the two boards together without the need for glue or complicated mounting steps, improving convenience and stability of use.4. PREMIUM MATERIALS: Crack monitor is made of premium ABS and acrylic materials with excellent durability and stability. At the same time, the choice of materials makes its data easy to read, providing clear monitoring results.5. FUNCTION: This standard crack monitor for building walls is used to monitor cracks in walls and their evolution over the measuring time, making it a practical and accurate measuring tool.Specification:Item Type: Crack MonitorMaterial: ABS, AcrylicWeight: Approx. 34g / 1.2oz.Package List:1 xCrack Monitor (2 Small Parts)4 x Expansion Tube4 x Screw1 x Instruction Manual