a circuit for use in a dmm utilizes an auxiliary a / d converter to measure the battery voltage of the dmm and displays the result on the lcd display screen of the dmm . the user receives a numeric indication of the battery voltage measured , rather than a simple good / bad or bar graph indication . the voltage measured provides the user with a quantitative indication which allows the user to determine how close the battery is to being exhausted . thus , the user can be made aware of a weakened state of the battery before operation of a backlight further drains the battery to an unacceptably low level .