How can I measure the parameters of an electret condenser microphone professionally? (lavalier)

I want to measure the parameters of a lavalier microphone like this one:

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The data I am most interested in are sensitivity, s/n ratio and frequency response.
To measure the frequency response, do I need an anechoic chamber?

What particular equipment do I need for a scientific measurement?

Thanks.
 
At higher frequencies a pulsed signal can eliminate room reflections in order to measure response, at lower frequencies you can compare to a reference microphone close by meaningfully, so in theory you may be able to avoid an anechoic chamber. And of course the noise source needs to be calibrated somehow.
Sensitivity is just the response at one frequency, and noise you may need an extremely quiet environment (padded box) to eliminate acoustic interference with a sensitive microphone, and of course a low noise mic preamp to measure it (with whatever bandwidth limiting and shaping you need for the particular noise specification).