Electronic Refractometers?

Humuhumununu

Reefing newb
I just posted another thread labeled ,"Differentiating Salt Parameters," and I was having trouble. I want to know if my Milwaukee Electric Refractometer is the issue. I did calibrate it both times, and it did get good reviews on the web, but I would also like to know if Electric Refractometers are just plain unreliable.
 
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