Are you asking if people do check their PH in CoCo, well the answer for that would be yes if you're using salts.
To do this you simply use a standard soil PH meter which cost nothing from any Garden center or DIY shop. If you want to spend a bit more you can get a long length one that will also tell you the moisture of you medium for about $35 off Ebay.
PH in CoCo is important as the range in which food is taken up isn't as wide as soil or Hydro... 5.8 to 6.2/3 is the range I feed my plants.