Minn Kota Digital Battery Meter 
Digital Battery Meter (MK-BM-1D)
- Monitors voltage level and "state of charge" of any 12-volt battery
- LCD display
- Compact frame for easy storage
- LED's indicate, 2/3, 1/3 or O "state of charge."
WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.