Refractometer

[Jayh86]

so need advice reading my refractometer. How is the best way to hold the device? If I hold it level I can get a reading, however if I tilt up towards the light the reading increases maybe 2ppt? Is this normal? I calibrate with RODI and I know when holding flat is the true reading but wanted to see if anyone else has this??

 

[GThompson]

I have to aim mine at the light but it doesn’t seem to change the reading at an angle

 

[absowry]

Make sure there aren't any air bubbles between the lense and cover.

Also I'd recommend calibrating with 35ppt (or 3.5%) calibrating liquid over rodi. From what I can tell, the span of the range isn't very accurate. You have a more accurate instrument adjusting it to your target value than to zero.

 

[lapin]

I take mine outside and hold it parallel to the ground. There is no need to point it at a light.