Sturdy and Practical: Made of aluminum alloy, this level ruler offers durability and accuracy. The wing screw allows it to be fixed on conduit for angle measurement during bending, more convenient to measure water pipes 4 Clear Bubbles: This mini level ruler is equipped with four clear and readable bubbles, 0°, 30°, 45°, 90°. These bubbles have an accuracy of ±0.029° = ±0.5mm/m, ensuring clear and accurate measurements Slim and Compact Design: With a width of 19mm, this level ruler is highly suitable for use in narrow and hard to access spaces, helping you accurately measure or compare the levels of different surfaces Magnetic Attachment: This bubble level ruler is equipped 4 magnets, providing strong holding power, allowing the level ruler to be fixed to iron pipes, conduits, or any other metal surfaces Standard Scales: The screw fixes the level ruler on the conduit for angle measurement during bending. Its cm and inch scale lines are suitable for length measurement or as straight line marking, practical for craftsmen, Manufacturer: Badafaci