Blue Sea 1842 M2 OLED Digital Bilge Meter

The Blue Sea Systems 1842 M2 OLED Digital Bilge Meter monitors up to four bilges, tracking run time per hour, cycles per 24 hours and average cycles.

A float switch tells you a pump ran. This tells you how hard it is working, which is a different and far more useful thing. A pump that always ran twice a day and now runs eight times has announced a leak, weeks before the water reaches a level anyone would notice on a walk-through.

Alarms and the relay can be triggered on run time or cycle count, so the meter acts rather than only displaying. That turns a diagnostic into a warning system, which matters most on a boat left unattended between visits.

The isolated 500mA MOSFET external circuit relay can control an external circuit from any measured value. The alarm is 80 dB and the display auto-dims. Face 55 by 28 mm, running on 7 to 70V DC at 0.3 to 1.0 watt. Bilge float switches are not included. Explore more marine electrical meters.

• Tracks how hard the pumps work, not just that they ran
• A rising cycle count is a leak announcing itself early
• Alarms trigger on run time or cycle count
• Up to four bilges from one face