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External Dimension:48×29×18mm Double Display,up 10 color bar displays battery, down blu-ray voltmeter (battery voltage) voltmeter decimal point automatic shift higher precision. The battery voltage at a glance. With low battery blink to remind, can identify the voltage fluctuations in a short period of time, two wire system, convenient connection. Pick up the protection. Low Consumption With Shell,Convenience for the independent panel or embedded products Package Included: 1X12v Acid Lead Battery Capacity Digital LED Tester