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Ah - I thought the readings would be taken one at a time, it would indeed be a problem if they were at the same time.
I am in need one one that can measure <0.2nm resolution.
Meatball, hopefully someone from UNL can hook me up?
The problem I had with mine is that the lines were so close together the peaks combined into one slightly wider hump, so although it had a peak in the 609nm region the multiple HeNe lines were not distinguishable.
This should be doable though with a high line count grating though. You lose total nm span but you could easily get down to the hundredths of a nanometer.
I ordered my grating from edmund optics, it was about $80 all said and done.