Check the listing for details. OPTIMATE 12V Battery & Charging System Tester Cranking & Alternator TS-121. Condition: New. Listed at 39.95 USD. The ultimate pocket tester for on-vehicle performance & alternator voltage testing with either 12V lead-acid or 12.8V LiFePO4 starter battery - easy troubleshooting from cranking to chargingChecks battery voltage to provide an indication of battery health; checks battery starting power and checks charging system without disassembly by indicating low charging voltageAs easy as 1-2-3, connect to battery, check state of charge, start engine tester displays cranking voltage and vehicle charge simultaneously - 15 seconds is all you needIncludes two cable straps, adhesive hook-and-loop straps and screws for use if mounting the removable backplate into an enclosureDisplay cranking volts down to 6V and charge voltage range up to 15V - check weak battery or overchargingEasy to use! Connect with the included clips to the battery or connect to an installed SAE battery leadBattery clips are removable and replaceablePART NUMBER - TS-121