Blue Sea Systems Mini OLED DC Voltmeter, Blue

The Blue Sea Systems Mini OLED DC Voltmeter brings compact, at-a-glance voltage monitoring to any panel with a spare 1-1/8" round hole — the same common cutout size used across countless gauges, switches, and accessories throughout the marine electrical world.

Key features

• Monitors 8-36V DC, 0.1V resolution, covering the two most common marine DC system voltages
• Bright, waterproof, daylight-readable OLED screen in blue
• IP66 waterproof rating for reliable performance in wet, exposed marine locations
• Reverse polarity protected, mounts in a common 1-1/8in hole with standard hardware

Because it covers the common 8-36V range, this same meter works on both 12V and 24V DC systems without needing a different model — a straightforward way to keep an eye on battery voltage from a compact display that fits almost anywhere. Its 10,000-cycle switching rating reflects a design meant for many years of routine sleep-mode power cycling.

Its small footprint suits console gauges, secondary battery bank monitoring, or any spot where a full-size digital voltmeter's larger cutout wouldn't fit. Pair it with the matching Mini OLED Ammeter in the same blue color for a complete compact monitoring setup.

Reverse polarity protection means an accidental miswiring during a DIY install won't permanently damage the meter — a reassuring safeguard, though correct wiring from the start is always still the better practice for a clean, safe, and reliable installation. The IP66 rating also means it can handle routine spray, rain, or a hose-down at the helm without concern for water intrusion damaging the electronics inside.