Sea-Dog Sea Dog Organic LED Voltmeter. 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. Features of Sea-Dog 421600-1 Sea Dog Organic LED Voltmeter Injection molded nylon Built to withstand the rigorous marine environment Quick and simple installation Waterproof OLED screen High contrast and resolution Package Contents: Sea-Dog 421600-1 Sea Dog Organic LED Voltmeter Sea-Dog 421600-1: Sea Dog Organic LED Voltmeter