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I use the MA887 myself. It works beautifully!
It states in the manual that you can use RO/CI or distilled water and it tells you to calibrate before every use. You do not need a solution.
Calibration fluid is tightly controlled and consistent by design. Not so with RO RO/DI. It is whatever the filter puts out and can be varied. When calibrating anything you want to use a solution which is as close to what you are measuring as possible. Think about it. Your targeting 1.025 and your dialing your meter in at 0.00 with RO or DI at unknown variables .
0.0 salt? I'm pretty sure.How do you know that your RO RO/DI water is 0.0?
I'll stick with my dial in meters and known solutions.