If battery status is important, you need this kit. This kit
uses 7 LED's to monitor 12v DC in 1v, 1/2v, or 1/4v steps.
You can also build it to monitor 8v or 5v in 1/4v steps. Great for boats, motor
homes, model planes or race car batteries.
All parts and instructions are included.
SIZE: 1.3" x 2.7".
Here is the instruction sheet for the VM kit.