How often do you recalibrate your refractometer?

I've been having to recalibrate mine with 1.026 calibration fluid every time before I can take measurements. Somehow it always drifts, plus I dont trust an instrument in my hands that hasn't been calibrated in a week.

 

Usually about once every couple months or when I feel like it is not giving me the number I thought it would.

 

I do the same, but mine has stopped drifting as much and as often after several months of use.

 

Mine doesn't drift as bad as it used too, but I still calibrate when I do my water changes just to be safe. So every 2 weeks give or take.

 

It's good to know I'm not the only one crazy here!

 

Does it have temp compensation? I'm surprised it drifts. I've found mine dosn't drift much, but it does have temperature compensation. I probably calibrate every month or so, sometimes less...

 

I check mine every few months but its been years since it needed any adjustments.

 

Mine never needs adjustment either. It's been years.

 

Mine is the Marine Depot house brand, and it does have auto temp compensation. I just think the spring inside needs time to settle down.