Fangrui Product Details [ Acrylic Construction]crafted From Superior Acrylic, This Crack Monitoring Device Offers Exceptional Durability And Resistance To Weather Elements. Its Designed For Repeated Use, Boasting Features Like Waterproofing, Sunproofing, And Resistance To Wear And Scratches. Installation Is Straightforward, And The Device Provides Clear, Intuitive Readings. [advanced Precision Technology]equipped With Cutting-, This Crack Monitor Gauge Is For Accurately Tracking Both Horizontal And Vertical Movements Of Cracks On Flat Surfaces. It Ensures Dependable Monitoring Of Crack Width Or Length Changes Over Time, Making It An Essential Tool For Structural Monitoring. [comprehensive Monitoring Capabilities]designed To Meticulously Monitor Wall Cracks And Their Progression, This Device Includes A Scale Plate With Horizontal And Vertical Scales And An Indicator Plate With Crossed Lines. It Offers A Measuring Range Of 1 Mm (0.04inch) On The X-y , With A Resolution Of 1 Mm (0.04inch), And Extends Up To 25 Mm