Which timing light should I buy?

AJ/FormS said

Doesnt the multiple spark feature turn off around 3000rpm? Thats about when my MAC lite seems to read accurate.

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It does and there was talk about that on some forums. I don't know if I could trust the advance at idle with multi spark going on though. I have never messed with MSD but I have sold a lot of timing lights over the years with rave results.