Calibration Fluid for Refractometers?

[Anonymous]

My refractometer says that it came with a bottle of ulta pure water for calibration fluid. There was no such bottle included. I am wondering if I can just use RO/DI water instead?

Also, the instruction say that it is very important that the ultra pure water be a 20 degrees C for the calibration to be accurate. Is that really all that important? That seems stange since there is no mention that your water that you are testing be taken to 20 degrees C. In fact, the directions simply say that the water being tested needs to be at the ambient temperature.

Louey

 

[sediener]

I think distilled water is better than RO/DI...

 

[Anonymous]

If you can get pure RODI water from your unit (read 000 ppm) then it will work.

My refracto has auto temp cal. I just put some RO water on it and turned the screw.

But if yours says to make it 20C, then I'd do it. Just microwave some water for a couple of secs.

B

 

[ZooKeeper1]

Just leave the water in the lense for a minute, so it comes to the temperature of the unit. I would use distilled to calibrate to zero, but you can also make a solution, so you can calibrate it to 1.026 using table salt. I believe R.H.F. has an article in the AA mag with the recipe.

 

[Anonymous]

I would use RO/DI water..and leave it on for roughly 30 sec for Automatic compensation..I think me and Bingo have the same Refractometer, mine is the same way...I really like it for the price...

 

[Anonymous]

I just use skimmate, ...what? doesn't anyone else?

 

[Anonymous]

RO/DI works fine afaik. Where the heck is 7E when you need him? :lol: