By testing at different parts of the electric fence and using the digital voltmeter you can see where you may have shorts in the fence or bad connections that cause a voltage drop which results in the fence being less effective than optimal.
The Thunderbird Digital Voltmeter displays volts in 100 volt increments upto 9.9kv
Note: you should not use a standard electrical multimeter to try and test an electric fence as the voltages are too high for this type of equipment.
Click here for directions on using the digital voltmeter to detect problems with your electric fence