Designed to simplify battery management, this Battery Capacity Meter can be used on 12, 24, 36 and 48 VDC battery systems using flooded, AGM and GEL chemestry. LEDs on the upper dial show present battery capacity. Three lower LEDs show the recency of the last full charge: "less than one week", "longer than one week", or "longer than two weeks." Handy for "at-a-glance" readings on golf carts, forklifts or any battery powered devices. The meter face is 5" x 4".