Midtronics PBT-300 Advanced Battery and Electrical System Tester, 12 Volt, 100 to 1400 CCA, Conductance, Cranking and Charging Diagnostics. Manufacturer: Midtronics. The PBT-300 Advanced Battery and Electrical System Tester can also be referred to as battery conductance tester, 12 volt battery tester, CCA battery tester, starter and alternator tester, and automotive battery and system analyzer.