Checking soil for Ph?

What and where do I get the stuff I need to checking the Soil for nutrients?

The most reliable tool that I bought to do this is the Bluelab PH pen, available at amazon, but even cheaper at other websites, just google it. I paid 130.00. Please don’t buy any of those CHEAP things that amazon sells for 14.99!!! A huge waste of money. buy it once, buy it right.

Thank you for the info!