- 3 in 1 voltage check, electric tester - CE,CCC,CQC,ISO9000 Certificated 3 in 1 voltage check, electric tester Specification: 3 in 1 volt check:*Auto Voltage range detected and LED display;*Double pole, easy use;*Rated Voltage Range: 110-550V;*Voltage Indication:110/220/380V AC150/300/500V DC*Voltage Meas.:50-500Hz.Any further enquiry please contact me by call or by email.