The SN100 Sewer Snooper is a small radio transmitter designed to easily travel inside a 10 cm non-metallic pipe attached to a standard rodding machine or sewer tape. It is 5,1 cm in diameter and 16,5 cm length. As it is forced through the pipe, any of A-Tronics' receivers trace the position and depth (up to 15 meter). This method is far more effective than energizing a metal tape inside the line.