Blue Sea 8247 AC Digital Multimeter with Alarm

The Blue Sea 8247 AC Digital Multimeter with Alarm is purpose-built for marine electrical diagnostics and preventive maintenance on boats and RVs. After decades on the water, any serious angler or boater knows that electrical faults—loose connections, failing alternators, and unstable shore power—can ruin a trip or create dangerous conditions. This compact, hardwired multimeter sits permanently in your electrical panel or galley, continuously monitoring critical AC voltage, amperage, power draw, and frequency parameters so you catch problems before they leave you stranded.

The 8247 displays real-time AC amperage (0–150 A), voltage (80–270 V), power consumption (0–45 kW), and frequency (40–90 Hz) with crystal-clear digital clarity—no squinting at analog needles in rough seas. Dual alarm thresholds (high and low voltage, high amperage) trigger both audible and silent alerts, letting you respond instantly to electrical anomalies without leaving the helm or galley. The robust design withstands marine vibration and corrosion, while the compact 5 × 4 × 8-inch footprint and 0.7-pound weight make integration into tight electrical compartments straightforward.

This meter is ideal for commercial fishing vessels, cruising sailboats, and weekend powerboats running generator-backed or shore-power systems. Technicians and do-it-yourself boat owners use it to validate proper charging output, confirm safe loads during high-draw events (air conditioning, water heaters, multiple refrigeration units), and detect ground faults or voltage regularity issues that strain batteries and electronics. Installation requires basic 120 VAC circuit access; consult your vessel's wiring diagram and consider professional installation if you're unfamiliar with marine panel layouts.