spoocter:
the if statement for vHigh is just a simple if the value has changed no matter how - print the value of the pot.
If you haven't changed the code since the last time it was posted, that's not true. The if statement reads "if the value has changed by greater than 2 since the last iteration of loop."
Loop runs very quickly, so depending on what is being measured, it might never change by 3+ in < 1 mS.