Voltcraft fy 64 analogue lead acid battery tester 6v 12v voltcraft fy 64 p the voltcraft fy 64 analogue lead acid battery tester is the perfect tester for quickly checking 6v and 12v lead acid batteries with regular multimeters it can be tricky to determine the remaining capacity in lead acid gel batteries under no load p p this battery tester loads the battery at a high current and measures the battery voltage under load batteries in poor condition will register a drop when measure