The Snap-on Wireless Battery System Tester, No. EECS400, helps techs conduct more 6V and 12V battery testing faster and more efficiently. The tester displays battery or battery pack condition as a percentage of available capacity, rated capacity (i.e. CCAs), and state of charge voltage as good, marginal or replace status. Test results can be sent to either a Microsoft PC (sold separately) via USB adapter (included) or a stand-alone IR Printer (optional HHGA-5 or 2-22566).