05-17-2007, 10:46 AM
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Calibrating your PH pen will need to be done using known calibration fluids. They are cheap. You can buy them from Dr. Fosters and Smith, Marine Depot or your LFS. They come in 7.0 and 10.0. You first calibrate to 7.0 and then calibrate to 10.0. The packets can be folded over and stored in the fridge. That is the only accurate method.
using distilled water does not guarantee anything. Who knows what method was used, when, did the package leach any chemicals, was the water ran back through a carbon filter/mineral filter to add taste to it, etc...... Basically it is an unknown source.
Now we all know why you get what you pay for. After the shipping costs, initial headaches of no instructions, and other similar problems it probably does not seem like such a good deal anymore. Personally for $85 I would have bought a PinPoint scientific PH monitor with a probe that can be left in the tank at all times.