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Blue Sea Systems 1733-BSS Mini Digital DA VoltmeterMini OLED VC voltmeter monitors DC voltage on a bright, waterproof, daylight readable OLED screen. Reverse polarity protected. Mounts in a common 1-1/8 in. hole.Features of Blue Sea Systems 1733-BSS Mini Digital DA Voltmeter Color: Black Mini OLED Voltmeter Reverse polarity protected Monitors DC vo..