think it is better to have one if it does not cost too much to save trips to Autozone.
is this one a good choice?
Amazon.com: KONNWEI KW208 12V Car Battery Tester, 100-2000 CCA Load Tester Automotive Alternator Tester Digital Auto Battery Analyzer Charging Cranking System Tester for Car Truck Marine Motorcycle SUV Boat : Automotive
Thanks!