milliamps, and a radio shack meter will be just fine
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Yes, a Radio Shack multimeter should do fine, but if you want something better you might consider Triplett, which has been around forever and makes both analog and digital meters which are widely used by electricians, electronic technicians, and engineers:
Also, Simpson was for many decades the leading name in high quality multimeters, although I have no knowledge of their recent products or ownership:
Another very capable digital multimeter with a good reputation and very reasonable price is Meterman, now marketed by Amprobe.
Whatever one you buy, be sure to get additional probes including ones which will clip onto test points. You will need your hands free to make the bias pot adjustments while watching the meter.