1. Press the BATT button and release it, the display will show the battery (House) voltage on the LED display.
2. If no other button is pressed, then the display will shut down after about 5 seconds. If the BATT button is held down, the display will continuously recheck the voltage and show the updated value. The reading may flicker back and forth between two values.
3. If another button is pressed before the 5 second time is up for the BATT button, the display will immediately switch to show the value for the new button. The 5 second time-out is restarted every time a button is pressed.
4. There is no hold mode for the battery voltage.