You don't use apostophe's to plauralise anything.

It's sometimes difficult to know if a word needs its apostrophe.

Sure is. How about Messsucher for example, three esses and not an apostrophe to be seen. Mind you, RF is an abreviation of Messsucher so maybe one should be in there somewhere but infact since rangefinder is a single word the error is having two effs in the site logo. It should have been RF's I think since F's is an abreviation of Forums. Did someone say that already...

p.s. and another thing, "120 RF's" should be "120 R's" as an abbreviation. So its wrong whether you think "120 RF's" should have an apostrophe or not :p
 
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