Wow ok, that's so extreme that I'd double check with a different method. I've never had much luck with those soil pH meters. You can mix up some plane water with a known pH to water in with. Water the plants to slight run off and then let that sit for a few. Then water in with the same water and collect the run to test the pH. That'll give you a better idea.
Another way is to take a soil sample and mix it into water with a known ph and test the pH of the slurry after it's had a chance to sit. It helps to give it a shake once in awhile before testing.