A self-contained, battery-operated sonde, measuring 64mm x 168mm (2.51" x 6.61"). It can be connected to a Flexrod for locating pipes and ducting etc. It transmits on 33kHz and can be normally located to a maximum depth of 8m (26').The sewer sonde has a very strong enclosure suitable for the most abrasive and rugged duty in municipal sewer systems. The sonde has a long life for daily use in all conditions.