四窗口同时显示: 电压、电流、功率、功率因数/频率4 display: V, A, W, PF or Hz
电流和功率上下限可设定，超限声光报警  Upper and lower limit of W and  A setting, and alert with sound and light when exceed the limit.
电压量程 Voltage:  10.0-500.0V
电流 量程 Current:  0.005 -20A
量程自动切换 Auto range
Accuracy：±(0.4%reading+0.1%range+1digit)