I’ve been a fan of Blue Sea Systems gear for a while now, they make things that are built for the marine environment. My thought process is what works out on the open ocean will surely perform in our vehicles. I bought one of their brand new Mini DC Voltmeters. This will be my first impressions of the thing and general info.

From the Packaging:

Blue Sea Systems

Mini OLED DC Voltmeter

Monitors DC Voltage

Bright, waterproof, daylight readable screen.

Features

• Reverse Polarity Protected
• Mounts in a common 1-1/8: (29mm) hole

Specifications

Nominal Voltage 12V / 24V DC

Voltage Range 8V-36V DC

Voltage Accuracy +/- 1%

Maximum Operating Current 15mA

Resolution 0.01V DC

Cutout Dimensions 1-1/8″ (29mm) Diameter

Regulatory

Meter face is IP66-protected against powerful water jets.

The Blue Sea part number is 1733.

A 2 AMP Fuse is required between the positive leg of the meter and incoming positive.

This can either be directly wired to your batter with a cutoff switch for easy off on use. Or wired inline with your ignition voltage. I have a house battery on my system so I’m using a ON – OFF – ON switch so that I can check my Main or my House with the flick of a switch.

It’s not overly bright at night so I believe it will work well in a car as well.

https://www.bluesea.com/products/1733/Mini_OLED_DC_Voltmeter