Twoplate crack monitor with overlapping partial lengths. The bottom plate is calibrated in millimeters, and the plate is transparent and marked with a crosshair cursor. Key specifications Scale: ±1 mm (±0.04 in) on the XY axis with a resolution of ±0.5 mm (±0.02 in) Horizontal range: ±20 mm (±0.79 in) Vertical range: ±10 mm (±0.38 in) Easy to use design Redesigned mounting post securely attaches the two boards without glue or complex mounting steps Improves convenience and stability during use Durable materials Constructed from ABS and acrylic for durability and stability Materials chosen to keep data easy to read and monitoring results clear Why you need it Provides precise, easytoread displacement measurement within the specified ranges Quick and secure setup without messy adhesives What it's compatible with or used for Structural testing and crack monitoring during load experiments Alignment and measurement in woodworking, metalworking, or engineering prototyping Smallcomponent or PCB assembly where precise overlay alignment or displacement tracking is required Use scenarios Monitoring crack opening during a smallload test to observe deflection within ±20 mm horizontally and ±10 mm vertically Quick alignment of two plates during assembly without glue, improving workflow and repeatability Reading and recording displacement data in a controlled setup where clear, stable readings are essential