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B&K: 4152 or 4153?

Dear all,

I'm about the buy the B&K artificial ear to calibrate the headphones of my lab. However, the more I read the less I understand about calibration-standards and the way things should be done.

In particular, I didn't understand whether I have to buy the B&K 4152 or the 4153.

Apologies in advance if this sounds like a silly question to you,