I use a FLUKE true RMS autoranging meter, but that's overkill for what you need. I also have a $20 analog multi-meter from ACE hardware.
Beside the low cost an analog meter is easier to see the trend of a changing voltage or current. You can also get another meter so you can look at voltage and current at the same time. If you want to see the numeric value of a steady voltage or current there are low cost digital multi-meters too.
For monitoring power line voltage and current I use a KILL A WATT plug in meter.
Be sure to get a variety of jumper clips so you don't have to hold the meter probes. But if you can eat with chopsticks you can sometimes hold both probes in one hand.