That's what you call a 7.5. You can look up the ph of bottled water that you have locally, and test your test, to make sure it is reading right. If so, might as well go with 7.5. I get that sometimes and that's what I do. You mainly want to keep it stable and the fauna should be ok, unless they have special needs. If you get that reading regularly, I wouldn't worry too much. Bear in mind that the ph will change a bit during the course of a day. More so if you are injecting co2 into your tank.