4 function in 1 detector,ultrasonic distance,Metal, Voltage and Stud Detector Features:1) Measures from 2 feet up to ... Detects wood and metal stud up to 3/4"3) Detects metal pipe up to 30mm4) Detects ... Ultrasonic distance measure6) Easy-to-read LCD7) Built-in calculator for measuring areas and volumes8) Adds and ... of 9V battery (battery not included) 4-In-1 Distance, Metal, Voltage and Stud Detector