2 Cigarette-Lighter Voltmeters: Choose by System Voltage

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Which plug-in voltage display matches your vehicle’s system voltage? One has 12V/24V input, while the other is designed for 12V negative-ground systems.

Product	Supported system voltage
DROK 200672 Voltage Temperature Monitor	12V or 24V
Innova 3721 Battery Monitor	12V

1. DROK 200672 Voltage Temperature Monitor

Best for 12V/24V voltage and temperature display

The DROK 200672 Voltage Temperature Monitor uses cigarette-lighter power and has a 12V or 24V input for cars or trucks. Red and blue LED displays show voltage and temperature simultaneously, with temperature displayed in Fahrenheit.

Before ordering, confirm your vehicle has a cigarette-lighter socket and a 12V or 24V system matching the monitor's input.

DROK 200672 Voltage Temperature Monitor

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2. Innova 3721 Battery Monitor

Best for 12V negative-ground voltage monitor

The Innova 3721 Battery Monitor plugs into a vehicle cigarette lighter or power receptacle to monitor battery and charging-system voltage. Its LCD shows measured voltage and a battery-level bar graph, while color-coded LEDs indicate charge status. It is designed for 12-volt negative-ground systems; these indicators are not verified as a battery-capacity or health test.

Before ordering, confirm your vehicle has a cigarette-lighter or power-receptacle socket and a 12V negative-ground system.

Innova 3721 Battery Monitor

View on Amazon

Which should you choose?

• Choose DROK 200672 for 12V or 24V input and simultaneous voltage and temperature displays; choose Innova 3721 instead if its charge-status LEDs and battery-level bar graph matter on a 12V negative-ground system.
• Choose Innova 3721 for 12V negative-ground systems when its charge-status LEDs and battery-level bar graph matter; those indicators aren't verified as battery-capacity or health tests. Choose DROK 200672 for 24V input or simultaneous temperature display.