Description 0.56 Panel Mounted LCD Digital Voltmeter 30-500VAC 0-100VDC 3.5-30VDC Calibrate Reading Red Green Blue LED Display Voltage Meter Detector Tester 220VAC 12VDC *** For Ruia, Spain, Ukraine, Belarus Customer *** If need better shipping way, click link below to check: Specification: Input Voltage: DC 4.5-30V / AC 30-500V Detection Voltage: DC 4.5-30V(2 cable) / DC 0-100V (3 cable)/ AC 30-500V (2 cables)/ AC 0-600V (3 cables) LED color: Red/ Green / Blue Cable Length: 20cm Marking: DC 4.5-30V old type can not calibrate the reading. Others all have the resistor to calibrate the reading. For the item of 30-500V AC, can not work with SCR Voltage regulator. If need to work with SCR Voltage Regulator, click the link below to buy theitem of 0-600VAC Packing: 1 voltmeter + 1 set connection cable Wiring Way 1. DC 4.5-30V Voltmeter 2. DC 0-100V Voltmeter 3. AC 30-500V Voltmeter