Vital Sine Refractometer Calibration

[alrha]

Do these need to be calibrated? or are they already calibrated at the factory?

 

[ken6217]

Albert,
Even if it is calibrated at the factory, it still needs to be done periodically as it will shift. I just use RO water and adjust it to "0".
Ken

 

[Percula9]

I recommend calibration solution.