A good battery load tester is essential for anyone who tinkers with cars, boats, off-road vehicles and more. Just because your battery shows 12v doesn't necessarily mean it's good to go. Test your car battery under a load to tell for sure. The Harbor Freight Cen-tech battery load tester also can show the status of your car charging system. They cost only $19.99 or less with your coupon.

Harbor Freight 100amp 6v/12v Battery Load Tester:
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