PINPOINT PH PROBE???

[aquasport24]

Does new probe needs to calibrate? and can i use Milwalkee solution 4.0 and 7.0 to calibrate PINPOINT probe?..THANKS

[JimD]

Since the average Ph of a reef is atound 8, you want to us 7 and 10 calibtation fluid. The Millwalke should be fine, you just need some 10. Its not the probe that you calibrate, its the machine.

[wesheltonj]

You can calibrate w/ 4 &7.

[JimD]

Really? How?

[OldSalty]

Speaking about probes, does anyone change out their probes? If so, how often? I've had mine for several years now and it seems to work ok.

[wesheltonj]

See http://www.americanmarineusa.com/phcontroller.html

[aquasport24]

Yep,i used a 4 solution instead of a 10. Worked just fine.

[JimD]

I trust the 7 and 10, but you go!

[apedroza]

You should always use standards above and below your expected pH to correctly calibrate a pH meter. Ideally you would want to use all three for a more accurate slope.