Joyce, You do not say, but I am guessing you want to know the pH of your soil in order to produce pink or blue blooms on your hydrangeas. At lower pH levels (acid soils) the plant will produce blue flowers and at higher pH ranges (more alkaline soils) pink flowers.

I found a science based website with information on hydrangeas
 https://ohioline.osu.edu/factsheet/hyg-1263 
and two (2) on soil testing
 https://ohioline.osu.edu/factsheet/hyg-1132   https://ohioline.osu.edu/factsheet/anr-0107.

These sites should provide you with the information you will need to care for your  hydrangeas, perform a soil test and locate a lab to do the testing. I wish you success with growing your plants and receiving enjoyment from them. Thank you for submitting your question to Ask Extension and do not hesitate to contact us again with any other gardening questions.