Differences between SM and PG or PGA microphones

Question
What are the differences were between the SM & PG or PGA series microphones?

Answer
The PG or PGA series are an entry level series, while the SM series is a mid level series.

The performance of the SM series is better, when comparing frequency response, polar response, handling noise, transient response, etc.

They both pass the same drop test and environmental tests.

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