CarCo Tester voltmeter, battery and alternator, with LEDs, EVANS 42845 CarCo

Instructions for Use/Warnings: Battery test: When properly connected, the OK LED should light up, and one of the LEDs marked with the battery icon should turn on, indicating the approximate charge level. Alternator test: With the engine running, rev it up to 2000 RPM. When correctly connected, the OK indicator should light up, showing the battery's maximum charge and alternator voltage level. Checking 'Correct voltage' means proper value. The 'Too high voltage' indicator means the voltage exceeds the correct value, and the charging system needs repair.