What you have i8s a not very reliable soil tester.
It is difficult to determine whether those soil p
H levels are good, bad, or indifferent. Contact your state universities Cooperative Extension Service and have a reliable soil test done.

Also, there are things you can do to ensure the best results possible with the equipment you have. If you're sticking the probe into the soil, try mixing distilled water and soil (50/50), let it sit for a few minutes and test.

In the past I have used a glass bulb pH meter for soil pH testing, but over time I found out that indicator dye solutions are accurate enough for growing blueberries, so now that is the method I use. About one teaspoon of dirt is mixed with enough distilled water to make a slurry, and the mixture is then filtered, to give a reasonably clear sample. A few drops of bromocresol green indicator is added. If the sample is blue, pH is around 5.4, and if the sample turns yellow, the pH is around 3.8. A green sample means the pH is around 4.6, and this is close to ideal for blueberries. There are other indicator solutions available, if you need to test a different pH range.