There are a few ways to check the pH and nutrient concentrations of your soil. You will need the tools.
Nutrient concentration and pH can be tested with test strips or drops, or you can get a digital pen and/or a soil probe. I recommend getting at least one of each of the digital pens. The nutrient concentration pens will read in EC(electrical conductivity) or a conversion of that number to a total dissolved solids(TDS) in a parts per million(PPM) number. The pH pen is a little easier as it only reads pH and measures the acidity, neutrality or alkalinity of a solution.
You can test these to get a general idea of what is in your soil by watering to near saturation and letting a little too much water seep out the bottom as “run off” and then test this solution with the pens
Also, to maybe get a little more precise and accurate reading of exactly what is in your soil you can also test it as described in Robert’s blog here: