Dust and water resistant for tough environments IP54 rated slope ruler designed to withstand dust and water spray, making it suitable for outdoor projects and construction sites. Easy to read in low light HOLD function locks measurements for easy verification. Threebutton backlight provides visibility in dim or dark environments. Magnetic base for hands operation Builtin magnet enables secure attachment to metal surfaces, allowing hands measurements when working on metal structures or frames. Durable and practical design Protractor and slope ruler built for reliable performance in challenging conditions. Compact and portable for onsite use. 1. Outdoor slope measurement on roofs or grading tasks at construction sites. 2. Layout and alignment on steel beams, metal scaffolding, or metalframed structures. 3. Lowlight interior work such as basements, warehouses, or lateday projects where backlighting improves readability.