This Hand Needle Detector is ultra powerful detector can locate a paper staple at 1/2" and a sewing needle at 1 1/2" Needle. The hand Needle Detector is designed for several applications including woodworking metal detection, materials inspection, etc. Ideal for pin pointing metal in fabrics, canvas, plastics, or other materials. Immediately alerts operator of where setting pins, sewing needles, or sewing machine needles, staples and other metal objects are left in materials.