Magnetic induction technology enables accurate localization of iron objects such as needles. This helps prevent missed needles and supports safer handling of fabrics, linens, and workpieces. Versatile functionality with sensitivity and quick adjustability. It provides both audible and visual alarms and can operate continuously without overheating or overloading, supporting reliable use across varying conditions. performance backed by advanced imported digital chips. The device delivers stable and durable operation, is easy to operate, lightweight, and sensitive for precise detection. Broad applicability for thin parts. Ideal for locating small ferromagnetic metal needles and pinpointing their exact location, making it suitable for a range of practical tasks. Use scenario: In medical or care environments, use during linen and clothing checks to locate stray needles before use, reducing risk of needlestick injuries and product contamination. Use scenario: In garment production or sewing rooms, locate lost needles in fabric to prevent damage to materials and machinery and improve workflow efficiency. Use scenario: In metalworking or maintenance settings, identify small ferromagnetic fragments or needles in parts or assemblies to support quality control and safe disassembly.