Needle Detector(Hand hold) Designed for small products detection or metal exact locating.Not just use for industrial also can be used in chirurgery of hospital to find the harmful metal inside epidermis of body. SPECIFICATIONS: TY20 Detection method: Magnetic induction Detection sensitivity: 0.8mm .1.2mm can be detected by 10cm distance. Detection Area: 65*40mm Alarm method: Buzzer,Lamp Power source: AD9V Dimension: 145*60*45mm Weight: 280g