Pushing the buttons activates the meter enhancing capabilities. Press the desired button to activate, and hold for about three seconds to deactivate the feature. For RANGE, press the button once to activate the manual ranging feature. This turns the auto-ranging meter into a manual ranging meter. Press the button again to see the decimal move, and press again to toggle to the desired range. When the manual ranging function is no longer needed, hold the button down for three seconds and the meter will return to auto-ranging.