Magnetic Induction Principle】The handheld portable needle detector uses the magnetic induction principle to effectively and accurately detect the specific iron position of needles and other items. Broken Needle Adsorption Function 】: The magnetic detection surface adsorption function will not miss any detection. Using the principle of magnetic induction, it can effectively adsorb and fix the detected broken needles. Can detect 1mm broken needles. High and Low Sensitivity Switching 】: high-end sensitivity detection 0.5MM-0.8MM, low-end sensitivity detection 0.9MM-1.2MM. It has high sensitivity, fast adjustment function and sound and light alarm function. High Performance 】: The handheld needle detector is a high-precision metal detector. It adopts high-end imported digital chips, with more stable and durable performance, simple operation, light weight, easy to carry, and high detector sensitivity. Service: We place great emphasis on our customers' shopping experience. If you have any questions, please feel free to contact us; we will respond to you within 24 hours!