Voltmeter with Selector Switch Accuracy:Class 1.5 3 phase 3 wire:100V,150V...500V. 3 phase 4 wire:60V/100V...300/500V. ..... Square Type Moving ... under long-term use at 70 and 120 respectively.4) 3 phase 3 wire Measuring range: 100V, 150V, 200V, 250V, 400V, 500V. 5 ... -L3, L2-L3(OFF Position is available on request).6) 3 phase 4 wire Measuring range: 60V/100V, 80/150V 100/200V ...