You can make any volt meter a "loaded voltmeter" by simply placing a resistive load in parallel with the voltmeter terminals. For 4 or 5 cell Nixx batteries, use a 10 ohm 5 to 10 watt resistor. this will draw 400 to 700 milliamperes for a load. For a 6 cell transmitter battery, use a 22 ohm 5 to 10 watt resistor to draw about 500 milliamperes for a load. You can get a pretty good VOM (volt-ohm-meter) from Harbor Freight or many hardware stores for about $5 or less.