I haven't calibrated my Refractometer in about 6 years.

[Lionfish Lair]

Does anyone else have one that simply has not strayed?

 

[FL_Reefer]

Mine has not in a little over a year, I haven't had to touch it

 

[Lionfish Lair]

Until recently it drove me insane. I never trusted it being right, because it was always so correct

 

[FL_Reefer]

As a reefer, I feel the same way sometimes too, lol but even after I check it, still the same every time.