According to a technician I spoke with at Milwaukee a few years back you don’t need to use two solutions (even if your controller has two set points) unless you plan to test solutions in either the high or low range. For an aquarium you will get accurate readings using just the 7.01 solution.
I’m not sure what probe Kayakbabe is using, but according to the technician I spoke to most probes only last between 12 to 15 months. You can test your probe by putting it in Windex with ammonia and seeing how fast the reading goes up to 10, it should be very fast. It doesn’t matter where it stops just so long as the reading is above ten. You can tell that you may need to replace the probe if the reading goes to ten very slowly or if it doesn’t ever get there. He said it’s kind of like a light bulb, when the filament burns out its time to change it. He said the reason Windex with ammonia is good for testing is that it has a high reading with no buffer to “pull” the reading up, like is used in the calibration solutions.
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