Features: The Magnetic slopes Measuring Ruler combines powerful magnetic adhesive with high accuracy angles detection, offering fast attachment to ferrous surfaces and accurate ±0.1° measurements for professional construction applications. Featuring an integrated angles conversion chart and ABS erosion resistant housing, this mechanical inclinometer requires not batteries while maintaining waterproof durability in harsh environments. Ideal for civil engineers, metalworkers, and enthusiasts requiring stable slopes measurement in construction site , metal fabrication workshops, or home renovation projects. Perfect for aligning HVAC ducts on steel frameworks, adjusting scaffold platforms, or verifying roof angles during installation and maintenance operations. Engineered with industrial grade neodymium magnets and scratch resistant markings, this magnetic angles finder ensures long term measurement consistency across wet/dry conditions without electronic components. Specifications: Component : ABS Size: about 97x96mm/3.82x3.78inch Package Includes: 1xSlope Measuring Ruler note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.