How to measure helix angle of Helical Gear ?

I have Input Pinion Shaft... I want To Drawing oF Shaft and I had Taken All Dimension .. But I can't Measure Helix Angle Of Helical Gear
I try Measure Helix Angle using with Bevel Protector But Cant Measure Exact Figure..

Any other way to measure it..?

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i don't know exactly. 3D scanning is one choice.i faced the same problem on before 3 weeks that time i tired lot , finaly i choosed 3d scanning.

 
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