Widely applicable vertical testing tool for decoration, construction, and related fields. The plumb bob features a magnetic element for strong fixing on iron surfaces, cement walls, plasterboard, and wooden surfaces, making work easier and faster. Key benefits - Reliable vertical alignment: quickly determine true verticality to improve accuracy in installation and layout tasks. - Versatile surface attachment: magnetic block fixes to iron surfaces; for wood or other surfaces use the positioning pin to fix securely. - Quick stabilization: retractable line with adjustable resistance accommodates different plumb bob weights (5 oz to 16 oz) and keeps balance stable with minimal setup. - Easy operation: lift the plumb bob and the line retracts automatically for efficient, continuous work. - Adjustable weight and balance: choose from lead weights in the range of 150 g to 400 g (approximately 5.29 oz to 14.10 oz), with automatic balance within a few seconds. What it is and how it works - Retractable plumb bob with a magnetic fixing option for iron surfaces and a positioning pin for wood and other surfaces. - Weighs adjustable from 5 oz to 16 oz to suit different job requirements. - The cord resistance can be adjusted to maintain balance quickly, ensuring stable readings during use. Surface compatibility - Iron surfaces: magnetic block adheres firmly for quick setup. - Wooden or other surfaces: use the included positioning pin to fix the plumb bob in place. - Cement walls and plasterboard: stable mounting with the magnetic or pin fixation as appropriate. How to use - Maintain a reasonable distance from the wall and pull down to establish verticality. - Measure the distance between the line and the wall at both ends to determine whether the wall is vertical. Specifications and options - Weight range: 5 oz to 16 oz (approx. 140 g to 450 g depending on model interpretation; primary reference is 5 oz to 16 oz). - Lead weights available: 150 g to 400 g (approximately 5.29 oz to 14.10 oz). - Features: retractable cord, adjustable resistance, magnetic block, and a positioning pin for wood. Practical use scenarios - Interior decoration and renovation: align cabinets, shelves, or tile layouts on walls to ensure true vertical alignment. - Construction or remodeling on cement or plaster walls: verify wall plumb and guide installation with a reliable vertical reference. - Woodworking and cabinetry installation: fix the plumb bob on wooden surfaces using the positioning pin to maintain accurate vertical alignment during panel or frame installation. Notes - The device is designed for both professional and amateur use, offering reliable performance across a variety of materials and application scenarios.