Few things are as discouraging as coming on board your boat, only to find a dead battery. Microlog has created two new affordable battery-monitoring systems, the DMM-3-BR (for two batteries) and DMM-4-BR (for three batteries). The monitors protect your batteries against deep discharges, provide accurate measurements of two and three-battery banks, and measure system charge, discharge, and net current; they can also measure incoming current. The devices draw a tiny amount of current, so they can be left on when the crew is ashore, and plug-and-play capability makes installation a snap. From $89.99. Microlog Technologies, Inc., 450-664-2664, www.micromediaplus.com/microlog.html
