Material: Acrylic Size: 10*3*0.9cm Weight: 36g Purpose: Can be used to monitor wall deformation/cracks Packing List: 1 pair of monitors + 4 screws + 1 monitoring table Features: 1. Easy to install, waterproof, sunscreen, wear-resistant and scratch-resistant 2. 1:1 original export, high transparent acrylic panel is clear and accurate 3. Crack monitoring gauges are used to monitor cracks in walls and measure how they progress over time Very practical: Because our Crack Monitor is designed with super clear acrylic panel and easy-to-read measurement grid, it is clear and accurate. Horizontal or vertical movement monitor: As a precision instrument, our corner crack monitor can be used to monitor the horizontal or vertical movement of cracks in a plane. Durable material: By using high-quality acrylic material, our crack gauge monitor has the characteristics of being durable, firm, smooth, strong, wear-resistant and not easy to break. Consists of two boards: The crack measuring instrument uses a clever design. It consists of two boards that overlap each other for a part of their length. The bottom plate is calibrated in millimeters and the top plate is transparent. Very practical: With our crack monitoring meter, you can monitor the cracks in the walls and the progress process over a period of time. It is very convenient for you. Note: The data is manual measurement, please allow 1-3 cm error. Due to the difference between light and screen, there may be a certain color difference. The specific reception in kind shall prevail.