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the needle may be to fill the inner reservoir with the inner reference electrode solution, usually silver chloride and/or potassium chloride. pictures will definitely help though.
the standards should be stored at room temp. this will give you the proper calibration, as readings will change with variations in temperature. just make sure the solution you're measuring is also at room temp so it falls on the same curve generated by the calibration. RO water is fine for rinsing, rinse and dry with a wipe between calibration solutions, and also before going into your unknown soln. you'll also want to store the electrode in some sort of aqueous buffer, maybe a bit of RO water with a few drops of the pH 7.0 standard, between readings. you don't want to let it dry out.
-------------------- "Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." - Abraham Lincoln
"There are a thousand hacking at the branches of evil
to one who is striking at the root"
~ Henry D. Thoreau
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