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What is the Lock/Unlock feature in EM64xxH series meter ?

Lock / Unlock:
Lock enables you to set the meter screen to default screen. You can scroll to other
display screens while a screen is locked. Once the manual scrolling is stopped, the
meter displays the default (lock) screen after 4 minutes.

Locking / unlocking meter screen:
The meter’s display screen and buttons allow you to lock or unlock any screen.
To lock / unlock a meter screen:
1. Press and hold the Up and Down buttons simultaneously for 2 seconds to
lock or unlock a meter screen.
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