How are you testing pH? I know there's the titration tests, meters, monitors, and whatever else is out there. I don't necessarily need a monitor but it that's most accurate it would work, just a little more expensive.
How Do You Test pH?
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Waterjockey
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I currently have continuous monitoring via apex, but have always used some form of meter, handheld, bench top, etc. Never liked test strips...but that is a personal preference, not necessarily anything wrong with them.
I use, an api, a litmus paper, a tetra strip, and a $14 pinpoint meter. i rarely test except when changing cal/ alk dosing, or when I started up the furnace.
Randy Holmes-Farley
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FWIW, pH is not ever a titration test.
I wouldn't recommend any method except a pH meter.
I discuss these issues here:
pH And The Reef Aquarium
http://www.reefedition.com/ph-and-the-reef-aquarium/
Aquarium Chemistry: Measuring pH with a Meter ? Advanced Aquarist | Aquarist Magazine and Blog
http://www.advancedaquarist.com/issues/feb2004/chem.htm
I wouldn't recommend any method except a pH meter.
I discuss these issues here:
pH And The Reef Aquarium
http://www.reefedition.com/ph-and-the-reef-aquarium/
Aquarium Chemistry: Measuring pH with a Meter ? Advanced Aquarist | Aquarist Magazine and Blog
http://www.advancedaquarist.com/issues/feb2004/chem.htm
Rob Lion
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I use a Seneye Reef, costs £100 (about $120) and it measures Temp, pH and Ammonia and records it every 20 minutes. It also calculates Ammonium (NH4), Oxygen (o2) and has a built in PAR/PUR/LUX/Kelvin meter 
only bad side is that the replacement slides you need cost £6 each ($8) for a months testing.
only bad side is that the replacement slides you need cost £6 each ($8) for a months testing.
