Sealey Polarity Free Professional Battery Drop Tester 6/12V (BT91/7PF)

American-style drop tester. Polarity protected cables – impossible to damage unit by incorrect connection. Load applied by internal switchgear – no sparking! Suitable for 6 and 12V batteries. Applies load across cells and measures output on meter. Accurate indication of battery voltage and faulty or short circuited cell.