The OLED (Organic LED) Voltmeter is designed to withstand constant vibration and the rigors of a marine environment. Monitors voltage on a bright, waterproof, daylight readable OLED screen. High contrast and resolution make this screen visible from a wide viewing angle, even with polarized sunGlasses. Reverse polarity protected. Constructed of injection molded nylon with terminal spade contacts. Installation is as easy as drilling a 1-1/8” hole, inserting the socket body, tightening the locking nut, and connecting the wires. Also fits Sea- Dog® Power Socket Shell (426100) and Mounting Bracket (426105). Input 8-60VDC. IP66 rating.