Offer arrived, can I still ask for more? - any advice?

I received an offer as a software tester and I think the pay is a little low. I have read a lot of threads here and could not find my exact situation. The benefits are decent. What wording worked?

If they say no, consider asking for something else, such as a review in six months.

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.