... 1--120A auto shift range 4.Certificate:ISO 9001 Three Phase standard energy meter1.class accuracy:0.022. ... active measurement.4. With LCD display and error calculator5.Three phase energy,voltage,current, power measurement and frequency, ... current ranges:0.1A,0.25A,0.5A,1.0A,2.5A,5A,10A,20A,40A,100A10.Power supply ... -accross60/90),3P4W(active, reactive-true) MDP2002A Three-phase Reference Standard Meter