Midtronics Battery and Charging Tester w/Printer MPMDXP300

12 Volt. The MDX-P300 is the first tester available from Midtronics that features a built-in printer allowing for immediate printing of test results from a handheld tester. Now it is easier than ever to show the current state of the battery and electrical system by providing customers with a printed result of the battery and system test. Using patented conductance technology, perform a quick, simple, and accurate battery or system test in seconds, and review the printout with the customer for added impact to preventive maintenance routines and customer service.