12v Dual Battery MonitorDESCRIPTION The monitor displays a digital readout for both main and Auxilary battery, it also shows a bar graph style incidator. Keep a closer eye on your battery with the new Ironman 4x4 dual battery monitor. The new monitor displays a digital readout for both main and Auxilary battery, it also shows a bar graph style incidator. To ensure your batteries are healthy the Ironman 4x4 monitor shows if either battery is under charged (11V) or over