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This talk about the pH controller prompts a question:
I have an UltraReef MD-101 which doesn't work properly - it will not show a
pH below 4.8 (or there about). The 7.00 calibration setting works, but the
slope setting to 4.01 doesn't. Needless to say, any measurement other than 7
On the inside, there are two adjustable components (pots?) with perhaps a
270 degree range i.e. the screw turns from left to right in a 270 degree
arc. I played with them, but it didn't help.
Does anyone have any idea what they are, how to adjust them or anything else
helpful to get this unit back into business?