How often should I calibrate a refractometer

[Orcrone]

Lately I find I need to calibrate my refractometer every time I use it. Is this normal, or is it time for a new one? Any suggestions for a replacement if needed?

 

[nos2074]

I do mine Everytime I use it.

 

[Orcrone]

I do mine Everytime I use it.

Do you find it's often off by 1 or 2 ppt, & sometimes more, each time?

 

[Eric]

I also calibrate mine before every use, it's off from time to time.

 

[Frankie]

I checked mine everytime also. The good news is I also have never needed to adjust it after the first time.

 

[kburg]

+1 Everytime

 

[r2d2]

Mmmmm... I didnt knew you have to recalibrate it every time you use it... Mine was calibrated about 2 years ago.

 

[Paragon]

I would say it's reasonable to calibrate monthly or quarterly.

Para

 

[Orcrone]

I would say it's reasonable to calibrate monthly or quarterly.

Para

So if I need to calibrate every time mine has issues.

 

[Goober35]

I check mine ever day. A refractometer is like a rifle scope the cheaper they are the cheaper the parts are inside and the easier they are to get out of whack.

 

[Orcrone]

I check mine ever day. A refractometer is like a rifle scope the cheaper they are the cheaper the parts are inside and the easier they are to get out of whack.

Good analogy. So having to calibrate each day does not mean it's broken, just means it needs more attention. Thanks....

 

[Goober35]

if you're having that much of a problem i would check to see if it is calibrated then check your SG and then check to see if it is still calibrated.

 

[Orcrone]

if you're having that much of a problem i would check to see if it is calibrated then check your SG and then check to see if it is still calibrated.

Not sure what you mean by whether it's calibrated. When I check it using my cal fluid I recalibrate using the screw on top, but then need to readjust pretty much every time I use it.

 

[Goober35]

NO what i am saying it you make sure it is calibrated then test your water then make sure it is calibrated again. This way you know if the refractometer did not change as you tested your water. And if it did you know your test is invalid.

 

[steved13]

My eyes are to old, I use a digital refractometer, I checked it daily at first, now more weekly, It's never been off since the first calibration when new.

 

[steved13]

+1 on the cal, test, cal. If it's holding it's cal after the test you know it's accurate. If you cal it to 0, then test water, then check the cal and it's not still 0, it's time for a new refractometer.

 

[Cloudburst2000]

You should calibrate every time because ambient temperature may affect readings.

 

[steved13]

Aren't most ATC...Auto temp compensation?