Ph Probes

[Roo&Lis]

First off, I found an incredible deal on PH probes for controllers. See link:

http://oceanaquatics.com/store/product/2757/pH-Probe-w-BNC-Connector/

Second, what is the difference between a lab grade vs. standard probe?

Third, what type of calibration fluid is recommended for a probe?

[ErikH]

lab grade is more accurate.
depends on your controller.

[Bill S]

For reef use, there isn't enough of a difference. Shoot, most reef probes haven't been calibrated in years. Lab units get calibrated daily.