Wide Range of 5 mA to 20 A The built-in 5 mA range lets you measure currents as low as 25 μA. This makes it possible to measure very low currents on such things as intermittent control equipment. The wide current range (5 mA to 20 A) means a single power meter can be used for applications such as Energy Star® measurements, to measure everything from standby-power to rated-power.