Denso BHT-6000 - Manual (Page 43)

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[ 2 ] Displaying the Battery Voltage Level
On the SYSTEM MENU or during execution of user programs, press the ENT key
while holding down the SF key for displaying the battery voltage level.
As long as you hold down those keys, the following screen is displayed.
In user programs, you can select the key to be used for displaying the battery
voltage level (instead of the default: combination of SF and ENT ).
The displayed battery level shows the terminal voltage of the battery, not how
much power is left.
The battery voltage level varies depending upon the operation of the BHT-
6000, so the displayed level also may vary by about 1 to 2 levels.
REFERENCE
Battery Voltage