Strong: Equipped with a built-in powerful magnet at the bottom, it can firmly attach to the ceiling joist, facilitating installation and measurement Wear resistant aluminum alloy: The thickened aluminum alloy ruler body is drops-resistant and wear-resistant, lightweight for easy portability, suitable for various construction environments Scale: Features a double-sided, clearly marked design for easy reading, enhancing measurement accuracy and meeting professional requirements Double Bubble Design with Base: The double bubble levels, paired with a base, is suitable for ceiling and tiles leveling, ensuring precisely positioning Extended 30cm: The extended design facilitates operations, easily adjusts to the horizontal height, and enhances work efficiency, Manufacturer: APGLSXY