I've decided to set up an automatic CO2 system for my 20 gal tank.
I've decided to go with an inexpensive "student" electrode as it has
high durability and sufficient accuracy for the task. Unfortunately
the only pH monitors that I have found are the 2 that dupla sells. Is
this it? Or am I going to have to spend $500 for a scientific grade
meter (which I won't).

Ken