... , transformer,alternating current source,and welder lighting. Also, it fits for the product line, lab, quality control department, computation department, inspection department and ... ,PF,Hz,W,VA,Var,kWh (optional)and harmonic value for voltage and current (optional).2. Integration function (optional).3. Printer ... .5A/2A/8A/20A.7. Accuracy:0.5class.8. Suitable for 1Φ2w,3Φ3w,3Φ4w,3V3A.