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OK well thanks for your time.

Actually, I didn't miss your point at all. As I said, the equationm describing the physics in play is: d sin theta = m Lamda lamda is the wavelength of the light. Theta is the angle of diffraction at the grating. For ANY AND ALL WAVELENGTHS - the angle of diffraction is proportional to it. In...

Heh. Such energy and blind conviction! This isn't a religious discussion, y'know. The physics behind the spectrometer is relatively simple. At the grating: d sin theta = m lamda - d and m ae constants, so the deflection is proprtional to the wavelength. This is a linear relationship. If you...

I have one. They quote 5nm accuracy but mine is neaerr to 1nm. The pro model comes with an interchangeabl;e slit plate allowing smaller slits to be used. Yes, it uses Theremino software which uses 2-point calibration. That seems to give very accurate measurements for my laser pointers, form...

I found another very cheap spectrometer, also using a webcam sensor, but it is well-made and reviews are excellent. Search for "i-Phos"