Pin point Ph monitor VS salifer kit

[dannynguyen3573]

I posted this thread over equipment forum but I have no reply. I hope I will here some from you're in here.
Have you're ever compare Pinpoint PH monitor and salifer test kit ? Last night I did a PH test with Salifer test kit, The PH is 8.3 (green color) and my Pinpoint is read at 8.1 . Which one is right ?


Thanks

 

[DrBDC]

Depends on which calibration solutions you use.

 

[dannynguyen3573]

I'm using 7 and 10 point calibration fluid.

 

[DrBDC]

What brand?

 

[Randy Holmes-Farley]

I would pick a pH meter over a pH kit if you were calibrating with a quality brand of calibration fluid, and had just calibrated. However, using a good brand of calibration fluid, making sure it is new, making sure the meter actually reads them correctly, etc, are all important parts of using a pH meter.

Measuring pH with a Meter
http://www.advancedaquarist.com/issues/feb2004/chem.htm

A Comparison of pH Calibration Buffers
http://reefkeeping.com/issues/2005-02/rhf/index.htm

 

[dannynguyen3573]

I'm using this one.
http://www.seaquestmarine.com/cgi-bin/shopper.cgi?KEYWORDS=pp_phc&SEARCH=search

 

[DrBDC]

If you read Randy's article on the buffers, you'll find those Pinpoint ones are good calibration solutions so I too would go with the probe readings.

 

[Randy Holmes-Farley]

If you use both 7 and 10, just opened them new, and the meter correctly read those 7 and 10 packets after calibration, then I'd be more inclined to believe the meter.

 

[Billybeau1]

Yes, as much as I like most of Saliferts test kits, the PH one leaves a lot of speculation. Very hard to read. I ended up buying a Pinpoint PH monitor and I love it.

 

[dannynguyen3573]

One more question, with pinpoint PH we can not deep the probe body all the way to water right?

 

[Randy Holmes-Farley]

I'm not sure about it in particular, but in general, I wouldn't extend probes all the way into the water so that the wires are in the water. In some cases that is OK, at least short term, but it is not always OK.

 

[dannynguyen3573]

Thanks a lot

 

[Randy Holmes-Farley]

You're welcome.

Happy reefing.

 

[DrBDC]

If you take a piece of styrofoam and make a hole smaller than the probe by just a little bit, then shove the probe through half way it will float real nice. After shoving it through check for little styrofoam balls in the end though.

 

[Randy Holmes-Farley]

then shove the probe through half way it will float real nice. After shoving it through check for little styrofoam balls in the end though.

Check to make sure you didn't break the glass tip too.