The Rocker Switch Sized Marine Dual Voltmeter is a practical and versatile product designed for monitoring auxiliary power in marine settings. With a voltage range of 10-60 volts, this voltmeter is sold individually and fits most round socket panels, making it compatible with a wide range of marine makes and models. Its compact size and easy installation make it a convenient choice for boat owners looking to keep track of their power usage. Stay informed and in control with this reliable and efficient marine voltmeter.