Item No.: C23A025
.Finds wood, metal studs and joists behind walls, floors, and ceilings .
.Detects wood up to 3/4 inch（19mm）. 
.Four LED visual and audio indicators. 
.Auto calibration stud detection. 
.Operated by one piece of 9V battery (battery not included).  
.Size：71.8*30*140mm. 
Weight：102g.