... changingDimension:(W) 50mm X (H) 26mm X (D) 23.5mm XL3600 series Digital Voltmeter ModelFull rangeResolutionInput impedanceMax.input voltageXL3600V-1±199 ... Yours sincerely, Linda Shaanxi XIELI Photo Electric Instrument Co., Ltd. XL3600 series Digital Voltmeter with LED display