Calibration fluid for refractometer

[DavidS]

Hi,

I was wondering if anyone may be selling Calibration Fluid for Refractometers at the Swap

DavidS

 

[cmantis]

I need some too. If not I think Gotham Aquatics has some. He is by the base of the BK Bridge in Manhattan.

 

[DavidS]

Wow that brings back memories from Hurricane Sandy.
It turned out I desperately needed a battery backup for my MP10 and they supposedly sold it. So I walked to Knickerbocker Village and walked up the 12 or so flights using a flashlight but no one was home.

 

[Affordable Aquatic]

Why buy anything. Just use your own RODI.

 

[DavidS]

Received an email from BRS who sells it. They suggest that you want to use a liquid that is already calibrated to the approximate density of reef water.
They imply, therefore, that using purified water may not be as accurate.
True or False?

 

[Affordable Aquatic]

Thats not exactly the case. You dont calibrate the refractometer to the density of reef water. Its calibrated to baseline on pure water. There are plenty of sources for pure water, your own RODI of course and steam distilled water available from drugstores. Think about the purity of distilled water which is often mixed with medications etc.

If you want to buy a sachet of water for a few dollars, have at it.

 

[DavidS]

I have used my RODI water, but when I saw that claim...
Thanks for the advice.
You just saved me a few bucks

 

[Affordable Aquatic]

Here you go from the manufacturer's mouth:

John, All optical or light diode instruments like photometers and digital Refractometers from almost all manufacturers, for optimum accuracy, require calibration to zero and usually require using steam distilled water or clear RO water. Selling Calibration fluid for Brix and Seawater Refractometers is just a ploy to increase sales on the back side of the original instrument purchase and these ?calibration standards? have the risk of being contaminated either through dilution or evaporation or settlement; putting the instruments accuracy at risk.

Hope that this answers your question
Milwaukee Instruments​

 

[DavidS]

That really seals it.
Thanks again and I'll see you at the swap.

David

 

[Sub]

If anyone still needs some, like for calibrating ph probes, I have some... $5 for a 7.0 and 10