Recent content by Mr.pH

That's not enough, you need two point calibration with two solutions. Although in most cases if the meter is working correctly calibrating it for 7.00 will give reasonably correct readings in the 6-8 range. Thing is, one point calibration doesn't give information whether the pH meter and pH...

The only way to be sure your pH electrode works OK is to use two calibration solutions. Not calibrated pH meter can b more dangerous than no pH measurements at all. I am not sure I follow you. Can you describe what you did in details? Calibration should be described in your pH meter manual, in...

First of all - AgCl is very weakly soluble, so even if you will put some directly in the tank, amount of silver freed will be below toxicity levels (especially in the case of salt water aquarium, so called common ion effect prevents silver chloride dissolution). Copper which is especially toxic...

In general lab practice calibration (http://www.ph-meter.info/pH-electrode-calibration) should be performed before every set of measurements, or at the beginning of every workday. However, in the case of aquarium, when the electrode is measuring pH continuously, it can be done much less often...

It will slowly degrade. The most possible scenario in lab is that readings become erratic and/or oscillating. However IMHO in the case of electrode that is continuously in the solution of almost constant pH, temperature and composition (as in aquarium) degradation may result in slow drift in any...

Good pH meter may survive you (it is nothing else but good voltmeter with high internal resistance, just scaled in pH units). Electrodes are much more probable source of problems. They come in several types (see http://www.ph-meter.info/pH-electrode for details). Double junction electrodes are...