RS PRO Digital Voltmeter, LED Display 0.1 V

LED’s Scan from “F” to “E” on power-up.(LED test mode)
The meter will automatically display the current battery power when connected to the battery.
When the battery voltage falls below the currently displayed LED bar for >155s, the highest LED segment switches off. The LED bar display function is that as the voltage level drops the LED segments switch off one by one, 155 seconds after the voltage falls below the threshold for the currently illuminated highest LED segment.
While charging, when the battery voltage increases above the voltage threshold of current LED bar for >200s the next LED segment illuminates. The charging status is shown from the first bar to the current bar. The LED bar display function is that as the voltage level increases the LED segments illuminate one by one, 200 seconds after the voltage increases above the threshold for the currently illuminated highest LED segment.
When disconnected then reconnected to battery, the meter will retest the current battery power and display the related voltage LED bar.