... wrong wiring connection for P3 Field meter testerMain features: 1) Large color LCD, friendly user's interface, display vector diagram and ... 3p3w2) Single or three phase active / reactive electronic or mechanical meter can be tested, directly measure voltage, current, frequency, phase, ... : temperature: -25 - +55°C, relative humidity: 30 - 80% MT3000D Portable field Energy Meter Multifunctional tester