|pH, Light, Moisture Tester|
You can purchase your own test kit. You will pay from a few dollars to hundreds of dollars. But if you spend more than $20 you are probably spending too much. You should be aware that many test kits have ranges on the pH scale they can accurately test. Testing ranges should be from about 4 to 8. The tester pictured at the right has a pH test range of 3.5 - 8. I have no idea how accurate it is. At $10 even if it isn't very accurate you won't be on the hook for much money. I have ordered one of these and will let you know the accuracy and ease of use sometime after it arrives. See the tool test for triple tester. It wasn't good.
To keep things in perspective, a pH of 5.0 will still grow great vegetables and the potatoes, blue berries, and raspberries will love it. pH as high as 8 will do the same but you potatoes may look bad. They will taste just fine but the potato scab makes them ugly. Making soils more acid is generally more difficult than making them more alkali. Instead of rewriting what other people have said about this I will provide this link for more acid and this one for more alkali. There are many other websites that will point you in the right direction just key in changing the pH of my soil on any search engine and you will get more articles that you could read in a year. If you are going to err make it on the side of acid soil.
There are certain plants that like quite acid soil (potatoes) and some that like quite alkali soil (honeysuckle). Check the seed packets, ask the representative in the garden center or greenhouse, or look it up online.