This is a Gallagher electric fence tester, but it's no longer working. More info in comments. : r/AskElectronics
By A Mystery Man Writer
How to use an Electric Fence Fault Finder
Gallagher Fault Finder Identify & Locate Electric Fence Faults
GREAT TIME SAVER - By using the Gallagher Digital Volt Meter you'll save hours diagnosing shorts and faults. The volt meter reads the voltage for
Gallagher Digital Volt Meter | Electric Fence Voltage Reader to Test, Trace & Diagnose Shorts and Faults |Auto Turn-On Indication | Easy Installation
Gallagher Fault Finder
Gallagher Smartfix Fault Finder battery reset & replacement
Gallagher Fault Finder
Gallagher Fault Finder
GREAT TIME SAVER - By using the Gallagher Digital Volt Meter you'll save hours diagnosing shorts and faults. The volt meter reads the voltage for
Gallagher Fault Finder | Identify & Locate Electric Fence Faults | Tough Pocket Size Digital Reader with Extendable Voltage Probe | 3-in-1 Device
Gallagher Fault Finder
Gallagher Digital Volt Meter