... 100ms.2. Technical SpecificationProperty projectSpecific parameterDisplay4 digit Red LED, 14.2 mm highDisplay range-9999~+9999(max.)Power ... for AC)A/D converterV/F convertPolarity displayNegative, the highest LED display “ - ”Overflow indication“ - - - - ”InputSingle inputPower supplyAC180 ... IBEST ELECTRICAL CO.LTD 4 digit display ,Digital Voltmeter ,Digital panel meter ,DC Voltage type Panel meter (IBEST ...