how do you check the ph?

I'm wondering where and how often do you check the pH? Do you use effluent or get a sample from the bottom, or are there any computerised options? I have seen cheap pH meters on Amazon, are they worth it? 

Forums: 

different possiblities. There some pH-Meters out there, so electronically. Or you go the old way and use pH-stripes.

www.chaseandsnow.com - websites & marketing