Blue Sea 8240 DC Analog Voltmeter - 2-3/4" Face, 18-32 Volts DC

The Blue Sea 8240 DC Analog Voltmeter is an essential electrical monitoring tool for any serious boater or angler who relies on a dependable power system. This compact analog gauge is crucial for monitoring battery voltage in real time, preventing costly mid-water failures and ensuring that navigation, fish finders, and safety equipment remain operational.

Built by Blue Sea Systems, the 8240 features a robust analog movement housed behind a 2-3/4 inch face that is readable in direct sunlight and poor lighting alike. It monitors the 18–32 volt DC range, making it suitable for standard 12V and 24V marine systems. The mechanical design requires no batteries or external power to operate, ensuring reliability even during complete electrical failure.

Professional anglers, charter boat operators, and cruising sailors choose the Blue Sea 8240 to monitor alternator output, detect parasitic battery drain, and confirm charging system health before heading out. Its stainless hardware and sealed bezel assembly ensure longevity in harsh marine environments, making it a trusted choice for those who depend on their power systems.