calibrating refratometer?

[autoponicz]

hi....just wondering if i can use RODI water to calibrate the refracto....?
or only distilled water will work?

 

[steveo32]

I used fw from the tap, idk if that was the proper method but it is on point, I double check with other refratometer and hydrometer.

 

[autoponicz]

so basically any freshwater will work.....because i used rodi and it was 2 bars above the 0

 

[reefman]

1st choice:Salinity Reference Solution
2nd: distill water
3rd: ro/di water

 

[autoponicz]

awesome.....thanks reefman

 

[drperetz]

...

ro/di is the closes i think.

 

[PalmTree]

Thats what I use. RODI that is.

 

[KathyC]

You're supposed to use distilled water according to the instructions..which is available at supermarkets, drug stores, etc..

If you don't feel like going out and buying a gallon of the stuff (costs about $1.00) you can make it at home (or so I was told anyway). If you take a clean pot with a clean lid and boil a little water ..the water that forms on the inside top of the lid is 'distilled' water... just pour it off into a clean cup..do it a few times so you have enough. Let it cool down to room temperature...and poof, you have free distilled water without leaving your home!

 

[autoponicz]

thanks kathy....i will try that.....

i had to get a new refractometer from ebay and it didnt have the calibrating solution.....

its also because i have a jbj digital salinity tester and im very unconfident on its accuracy...which reads 1.023.......according to my refracometer.....my salinity is about 1.028!

 

[regal]

..you can make it at home. If you take a clean pot with a clean lid and boil a little water ..the water that forms on the inside top of the lid is 'distilled' water... just pour it off into a clean cup..do it a few times so you have enough. Let it cool down to room temperature...and poof, you have free distilled water without leaving your home!

That's a great idea, Kathy. You only need a few drops for the refractometer. I put a clean dry plate in the freezer for 15min, take it out and hold it over either a pot of boiling water or in my case the hot water maker, the distilled water will condense on the cold plate and falls off the plate onto the refractometer. A few drops are all I need.

 

[reefman]

i buy a gallon of distill water n last me a lifetime.
btw: u can also use it for cleaning testing equipments.