... for Food Use for detecting the broken needle of all knitting, costuming, shoes, socks, quilt Handheld needle metal detector ( TEC-S210 ) Search ... up and down. Detection rangeUse for detecting the broken needle of all knitting, costuming, shoes, socks, quilt etc.Use for detecting ... the your work. To prevent battery leakage destroy the handheld needle detector, Please take out the battery for long time ...