BAINTECH Flush Mount Single - DC 12 Volt LCD Meter
This is your basic meter: no bells and whistles, but no big price tag, either. It simply gives you a reading of the current voltage on your battery. If you want an inexpensive, easy-to-install, basic meter, this is the one to choose.
The Baintech Volt Metersheds light on your power status. Compact, affordable and easy to self-install, this single unit lets you measure the DC voltage of a single battery bank.