The Nor150 has a dedicated keyboard. Most of the functions can be selected using it.

The keys have background light so they are visible in the dark.

Up Down Left Right move the selected cursor or value in the selected direction.
Enter Cancel accept or reject current selections.
Start/Stop and Pause controls the measurement sequence.
Menu gives access to the main menu system.
View steps through the sequence of selected views.
Report alternates between Global and Profile results (if available).
Channel (Ch): selects from which channel (or combination of channels) results are displayed.
Table shows the results numerically.
Function allows you to select the displayed functions.
Memory (MEM) allows you to store and load measurements and setups.
Calibration starts the calibration menu.
OnOff Hold the button down for some seconds until the power is turned on or off

An on-screen keyboard (alpha or numeric) is displayed in some menus. This is for entering information you cannot key in with this front panel keyboard. Tap on the screen to edit texts and numbers, and terminate the sequence with the OK button.