Testing with vinegar and baking soda can tell you on which end of the pH scale your soil is leaning. But for an exact measurement, a soil pH testing kit is the way to go.
1. Dig for a Sample
Using a hand shovel, dig 4 to 6 inches below the surface of your garden to obtain a soil sample.
2. Place 1 to 3 Teaspoons of Soil in a Clean Glass
Remove sticks, stones, and other debris.
3. Pour in Distilled Water
Fill the Glass with Distilled Water to the Same Level as the Soil Sample
4. Agitate the Soil Vigorously by Stirring or Swirling
Then, let the solution rest for 30 minutes.
5. Pour Soil Sample Through a Coffee Filter and Into Another Clean Glass
Make sure that you are capturing the solids and allowing the liquid to pass through.
6. Dip the pH Test Strip into the Liquid
Compare the color it turns to the chart on the manufacturer's packaging to determine the pH.