High Sensitivity mini type sewing tablet hand held needle detector

High Sensitivity mini type sewing tablet hand held needle detector ST-30C type sensitivity level can be adjusted handheld needle detector , this model is our latest product launch of a hand-held needle detector has low sensitivity, a key regulatory function, the detection sensitivity is extremely high. Particularly suitable for metal buttons, metal zippers ferromagnetic check job ( over needle ) ; demanding for testing children's clothing, underwear applies. Which handheld