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 battery system. After years on the water, you learn that knowing your voltage at a glance can be the difference between a successful day and a stranded hull. This 2-3/4" face voltmeter provides immediate, real-time feedback on your 18–32 volt DC system, eliminating the guesswork about battery health and charging status. Whether you're running a twin-engine saltwater rig, a freshwater cruiser, or a center console, reliable voltage monitoring keeps your electronics, navigation, and safety equipment running without interruption.

The Blue Sea 8240 uses a straightforward two-wire connection design that eliminates installation complexity—the meter powers itself directly from the same circuit it monitors, requiring no separate power feed. Its backlit analog face is legible in bright sunlight and low-light cabin conditions, a critical feature when you're checking battery status before departure or during night operations. Analog meter movement responds instantly to voltage fluctuations, giving you intuitive feedback that digital displays sometimes mask. The 5 x 3 x 6 inch panel-mount form factor fits standard marine electrical panels and integrates cleanly alongside other instruments, while the compact 0.2 lb weight has no meaningful impact on your boat's weight distribution or center of gravity.

This voltmeter suits both 12-volt single-battery systems and 24-volt or higher multi-battery setups common on larger commercial and recreational vessels. Installation takes minutes—connect positive and negative leads to your main bus bar or battery terminal, and you're monitoring. Experienced captains and fleet operators rely on Blue Sea instruments because they work without fuss in salt spray, vibration, and temperature extremes. If you're upgrading an older panel or installing fresh electronics, the Blue Sea 8240 delivers the baseline voltage awareness that prevents dead batteries, failed starts, and expensive service calls dockside.