Grace F-9

Wondering how to tell if a F-9 cartridge is a high or low output cartridge? thanks
The mv output for the F9 series was 3.5mv. They differed only in stylus type and tracking force. I have a data sheet which lists the specs for the whole F9 series. If u have other questions about it just email me. shay
Hi and thanks for the responses. US cityrecords ad for a f9e which states that the output is 5.5 is what prompted the question. I own a f9 ruby and love it and am thinking of adding another to my collection so I want to make sure of the facts.
So, I just checked vinyl engine and there are a couple of the f9's that are 5.5. So my question still stands , how do you tell the difference? Is there a marking?
It really does not matter. 3.5 or 5.5 mV it's more or less the same. Both are typical MM, high output cartridges. To my knowledge, Grace did never make any low output cartridges.

Excellent cartridges though. I owned a Grace level II since 20 years.