4 function in 1 detector,ultrasonic distance,Metal, Voltage and Stud Detector Features:1) Measures from 2 feet up to 50 feet ( ... metal pipe up to 30mm4) Detects AC line wire 75mm5) Ultrasonic distance measure6) Easy-to-read LCD7) Built-in calculator for ... not included) 4-In-1 Distance, Metal, Voltage and Stud Detector