Folks that full time or have a more specific need requiring more information from their system is a valid point. Those of us that are weekend warriors, but do take proper care of our 12 volt systems, I don't believe need the higher end monitors. I use a hydrometer & smart charger for my batts & keep them in storage during the off season on a trickle charger. The Volt Minder that I use is accurate enough for my needs. I checked it with my Fluke upon purchase & it was within .02 reading. and it sure beats the hell out of the coach monitor. :B