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The meter "volt-alarm" shows a flashing light should there be a sharp drop to the fence voltage. The switch on the front allows you to select different voltages as you wish.
It will flash below that level giving an indication that the fence needs to be looked at and repaired. A very useful optical function at night and dusk.
The device is simply hooked into the existing fencing material (does not require a ground connection).
Includes a lithium button cell. If the alarm is not flashing then the battery should last in excess of a year. If it is constantly flashing then this is reduced to about 6-8 weeks