How can we view the firmware version, model and serial number of EM6400NG meter ?

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You can view the meter’s firmware version, model and serial number from the
display panel.
1. Press and hold Down and OK button for 2 seconds to enter diag page. Meter
display shows all LEDs turned on.
2. Press Down button to view meter model, serial number, OS version, and RS
version.
3. Press and hold Down and OK button for 2 seconds to exit diag page.