The NEIKO 40510A Car Battery Tester is a budget-friendly load tester designed for both 6-volt and 12-volt automotive batteries. After extensive testing and analyzing consumer feedback, I’ve found it to be a reliable diagnostic tool for DIY mechanics and farm owners who need to monitor multiple batteries without spending a premium on name-brand alternatives. While it has some limitations and quirks—including the infamous initial smoke during first uses—it performs its core function admirably, providing accurate load testing for battery health assessment at a fraction of the cost of premium testers. Bottom Line: A worthwhile purchase for anyone who needs occasional…