[Premium Acrylic Material] This crack monitoring record is made of high-quality acrylic material, which is sturdy and reusable. It is waterproof, UV-resistant, wear-resistant, and scratch-resistant. It is easy to install and intuitive to read. [Advanced Monitoring Technology] This crack monitor gauge uses advanced technology, ideal for tracking horizontal and vertical crack movement on flat surfaces. It enables reliable detection and monitoring of changes in crack width or length over time. [Purpose] This crack monitor gauge is designed to monitor cracks in walls and track their development over time. The instrument consists of a scale plate (with scales in both horizontal and vertical directions) and an indicator plate (featuring one or two crossed indicator lines). [Wide Application] This crack measurement and recording instrument is widely used for observing crack opening, closing, and misalignment on various building surfaces. It can also monitor relative displacement between two points in horizontal and vertical directions. [Features] - Waterproof: Suitable for indoor and outdoor use; resistant to moisture and weather exposure. - Easy to Read: Clear scale markings for accurate visual assessment. - Durable Construction: Made from high-quality acrylic for long-term reliability. - Simple Installation: Includes screws for secure mounting. [Specifications] - Product Name: Crack Monitoring Record - Measuring Range: –30 mm to +30 mm - Resolution: 1 mm - Measurement Accuracy: ±1 mm - Ruler Size: 100 x 30 mm - Material: Acrylic - Color: As shown [Package Contents] - 3 Pairs of Crack Monitoring Records - 12 Screws - 3 Monitors [Notes] - Slight color variation may occur due to screen settings and lighting conditions. - Slight dimensional variation may occur due to manual measurement. - Package includes only the items listed above.