how do you check your salinity

Milwaukee MA887 is my preferred choice

Quick question... I think it might be time to look at a new Refractometer. My milwaukee mr100atc does not see to adjust as well as it used to and it seems to get out of adjustment more than I would like. Do you still like the MA887? Some complain it is a pain to use but it looks simple enough. I just put a apex PM2 on the tank but I want another way to check and the Apex is about 3ppm off from the Refractometer even when I calibrate.

Thanks for any info.
 
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