Accuracy Class 1.0, 0.5, Input Voltage measurement range 50-520 Vac (P-P), Aux supply 80-300 Vac, CT secondary site selectable 1A/5A, Flush mounting 96x96 mm, Inbuiult Selector switch for 3 phase meter, CT/PT Site programmable, Frequancy parameter availabe in 3ph voltmeter additionally.