Amprobe ACD-6-PRO Clamp-On-Multimeters - Manual (Page 9)

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HOLD
The hold feature freezes the display for later viewing. Press the HOLD button
momentarily to activate and to exit the hold feature.
Relative zero mode
Relative zero mode allows the user to offset the meter consecutive measurements
with the displaying reading as the reference value. The display will now show readings
relative to the stored reference value. That is, display = reading - stored value. Press
the button momentarily to activate and to exit relative zero mode.
Manual or Auto-ranging
Press the RANGE button momentarily to select manual-ranging mode, and the meter
will remain in the range it was in, the LCD symbol turns off. Press the button
momentarily again to step through the ranges. Press and hold the RANGE button for 1
second or more to resume auto-ranging mode.
Auto Power Off (APO)
When the meter is on, the Auto Power Off (APO) feature will switch the meter to sleep
mode automatically after approximately 30 minutes of no slide-switch or push button
operations to extend battery life. To wake up the meter from APO, press the buttons
momentarily or set the slide-switch to the OFF position and then slide back on again.
Always set the slide-switch to the OFF position manually when the meter is not in use.