... single and three phase portable working standards, ideal for on site testing. Either direct current connection or current clamp connection is possible. ... : 0.1%, 0.2%, 0.5%.* Display of: Voltage, Current, Phase angles, Active Power, Reactive Power, Frequency, Power Factor, ... Large display screen for the display.* Analogue connections to the device under test (e.g. energy meter) are made using ...