Voltmeter
Energy meter
Ammeter
Watt meter
influence errors
switching errors
device errors
human errors
+/- 1.5%
+/- 2.0%
+/- 2.2%
+/- 2.3%
0.1 to 0.15
0.1 to 0.2
0.1 to 0.3
0.1 to 0.4