Display Phase value from graph

Hi,
I'm pretty new to Labview and I had a question about reading phase from a graph. Attached is the phase vs frequency but it's a bit difficult to pick out what exactly the phase is at a value. Is there a way to specify the frequency and have Labview display a numerical answer at that point? For instance could I input 50 hz into a box and have labview display 30 degrees? Attached is my phase shift plot.
Attachments:
phaseangle.jpg ‏99 KB

Here's another simpler example.
The input wave is 50 and 120 hz cos wave which shows up great on the magnitude but the phase is all wonky. I've applied windowing functions and unwrapping the phase neither of these seem to help out much.
==edit==
An an even simpler example is this 100 hz sine wave. The phase is also unreadable for this one.
Attachments:
phase2.jpg ‏311 KB
phase3.jpg ‏340 KB

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