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Monitor charge of any 12V lead-acid battery or confirm if vehicle charging system is working correctly. For any 21mm AUTO socket. Battery charge level: LED matching charge level blinks every 5 seconds (long term draw less than 0. 2 micro Amps). Fast blink mode for first 15 seconds after connection to battery, ideal for testing multiple batteries (e. g. vehicles on showroom floor). Vehicle Charge system: LED arrow mode activates when charge voltage reaches minimum 13. 5V (√green LED) or ideal range of 14V+ (√√ green LED).