Item No.: C23A250
.Detect wood and metal stud up to 3/4 in (19mm)  
.Detect metal rebar up to 3 in (76mm)  
.Detect AC live wire up to 3 in (76mm)  
.Auto callbration metal,voltage and stud detection  
.Audio and visual indication   
.Operated by a 6F22 9V battery(not included)