The Tune interface shows the parameters associated with the movement of the printer. Including:
L-Nozzle temperature: the temperature of the left nozzle.
R-Nozzle temperature: the temperature of the right nozzle.
If your machine is a dual-extruder machine, it will show L-Nozzle temperature and R-Nozzle temperature.
If your machine is a single-extruder machine, it will only show Nozzle temperature here.
Heatbed temperature: the temperature of the heat bed.
Feed rate: speed factor override percentage.
Fan speed: the speed of the fan which in controlled slot.
Note: only the right lower fan on single-extruder machine can be controlled.
L-Nozzle flow rate: the flow rate of the left nozzle.
R-Nozzle flow rate: the flow rate of the right nozzle.
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