Voltage test range: 0.001V-45.00V, maximum resolution 0.001V Internal resistance measurement range: 0.1m -6.999 , maximum resolution 0.1m Data recording: Supports recording 5 sets of internal resistance measurement data Automatic shutdown: supports 1-9 minute standby time adjustment Backlight brightness: Supports 1-9 levels of display backlight brightness adjustment Product Name: TS457 Voltage Internal Resistance Tester Attention: It is prohibited to test AC power and voltage above 45V Working voltage: DC5V (do not provide overvoltage power supply) Testing principle: AC 4-wire method Voltage display fine-tuning: supported Internal resistance display fine-tuning: supported Accessory : XH-2.54-2P red and black power supply wire length 150mm Accessory : XH-2.54-4P signal acquisition line with a length of 400mm Product size: 79.5 x forty-two point 27.8mm Installation hole: 77 x 39.3mm Specifications:A:Meter + power supply cord + battery holder Material:Plastic Package Contents: 1 * Battery Internal Resistance Tester Kit