The digital multimeter, DMM, is one of the most common items of test equipment used in the electronics industry today. While there are many other items of test equipment that are available, the multimeter is able to provide excellent readings of the basic measurements of amps, volts and ohms.
Here are the basics of the rules, which will apply to drones weighing fewer than 55 pounds: pilots will have to pass a knowledge test (but not a practical test) to get a newly developed drone operator license and will have to be vetted by the TSA.
But the regulations may be a moot point unless delivery drones can actually get where they're going and back. Commercially available quadcopter drones such as the popular DJI Phantom 2 can fly only half an hour or so on a day that isn't too windy while carrying less than a pound of payload.