Single-Frequency locators are designed specifically to perform at the highest level on specific applications. E.g., The VM-810 is perfect for water and gas distribution and the VM-850 is excellent at pipeline and long distance cable applications.
VM-810
The VM-810 receiver is single frequency (83kHz), left/right guidance, automatic gain control (AGC) system that replaces the legendary 810 in the locating industry for both performance and ease-of-use. The 83kHz is ideal for gas distribution, water pipe, and tracer wire applications.1-watt transmitter output.