ANSMANN 1900-0019 Power Check 12 / 24V test / tester LED voltmeter voltage tester for cigarette lighter 12V and 24V car battery (tool)
Came well packaged with me. Is small and handy. In the car cigarette lighter is plugged in and you can read the battery voltage. Here is a small table, from which you can see how much the battery has voltage% yet. One knows immediately know when the
