Signal ruler
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Signal ruler is a vertical line which moves over the signal following the mouse pointer. It can be used to measure parts of the signal or to see the value on certain position.
The current position of the ruler and the corresponding value from the signal at that position are available in a tooltip next to the ruler in the top of the window:

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Signal ruler is used for various navigation or selection functions in signal windows, for example Selecting part of the signal, Signal annotations or Working with clipboard.

Harmonic ruler

By turning Harmonic ruler option on in the context menu of FFT-based  and signal calculator windows, the ruler will be shown on the current position of the mouse cursor as well as on all harmonics of the current frequency (current frequency x2, x3, x4, etc.)


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Signal ruler