I've not used pH probes before but I've read various posts about cheap probes and how many have instead bought lab grade probes. Since I am probably going to buy an Aquacontroller to automate my aquarium (Neptune Systems) that has the ability to control a CO2 solenoid, I figure I might as well use it. I've just done the on with the lights approach until now. They have an optional lab grade probe for $70 (their standard grade is $45). I was curious if anyone has used this and if its good, or if I should try to get a different probe?