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0.56inch DC 0-30V 3 Wire DC Voltage Volt meter.Features :Size:48*29*16mmcut size:46*27mmReverse Connect Protection.Range: DC0-40V( power supply 4.5-30V )Display: 0.56 "LED digital tubeDisplay color: red blue greenRefresh rate: about 200mS / timesInput: DC voltageResolution: 1% +1 digitcable:20cmweight:17gOperating temperature: -10 ℃ to 65 ℃resuloti..