A 512Hz receiver for all sewer line locating, both cast-iron and non-metallic. Locates lines and determines depths to an accuracy within an inch Used in conjunction with either SR-2512 transmitter (main line) or SR-512 transmitter (small entry) Pulsing high range signal for easier identification in high interfernce areas Three position swivel antenna and lighted tracking display Signal adjust control and maximum tuning dial High impact "Gun-Style" plastic housing Powered by 8 "AA" batteries Weight : 3.5 Lbs. !