The RF head can be extended with the extension handles and cable. Plug the cable BNC connector into the BNC jack at the bottom of the RF head. The 2055HA say also be used as a single antenna RF detector by removing the left antenna and zeroing the unit. The meter will swing only to the right when a source is located If the meter goes beyond full scale to the right, the zero may be suppressed to the left of center as required. This output is designed to drive a strip chart recorder.
Alkaline batteries are always preferred.
The one in the upper center above the upper integrated circuit is the rough zero. To adjust the base tone, zero the meter and set this control for a tone output of roughly 5 to 20 Hz. As with any piece of electronic equipment, remove the batteries during periods of prolonged storage.