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Smh........................
Are you sure your RO RO/DI has no trace salt content in it? How many stage is the RO/DI unit? How exhausted are the membranes? What is the TDS reading? When you calibrate using o as your base, you are way too far away from your testing scale for all kinds of anomalies. This is why I kinda don't understand why electronic refractometers (Milwaukee) dont have an option to calibrate to anything but 1.000, or ro/di. There is no way to calibrate it to 1.025. Does'nt make much sense to me. If a refractometer has a deviation or margin of error of 1% per .001, that means that if you calibrate it to 1.000 with DI Water, that reading 1.025 might be as much as 25% off. Granted, this is a highly exaggerated situation for the purposes of explanation. That's why I only use a "Dial" in meter. I can take a know calibration solution of 1.025 and know my meter is dead on.
Milwaukee provides steam distilled water for 0.00 calibration and a 1.025 sample for validation of calibration. I think they are 100% on their game. Maybe back in March they didn't supply these solutions with the instrument?
The newer models and etc come with the 0.00 and 1.025 control samples. Older productions of the products did not. I recently purchased another digital refractometer and noticed the controls were provided. I found this to be pretty awesome.
Good for you. You do that.
I don't know why you are arguing with the instructions of the instrument manufacturer anyway.