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Greebe
10-31-2009, 05:58 PM
So I need a refractometer for testing my coolant. I would also like to be able to use it for testing my vineyard as well, so I was thinking of buying one that would read brix to about 30% or so.

I don't want to spend a fortune on one just something that will be usable and fairly accurate.

A lot of the ones I see say they are accurate to +/- .20% which would only be +/- .01 for a reading of 5 Brix which seems like that would be accurate enough.


Any recommendations?

Thanks
Greebe

HSS
10-31-2009, 07:16 PM
Hey Greebe, I'm not sure the refractometer will read both antifreeze and sugar content with any accuracy. I have one refrac for propelyene glycol, ethelyene glycol and battery acid with corresponding scales, then another refrac for sugars with a corresponding scale for sugar. There is no scale on either for other than specified.

Patrick

Edit: And a third refractometer for POE oil.

andy_b
10-31-2009, 10:42 PM
what are the specific gravity ranges of the items you will be testing?

andy b.

Greebe
10-31-2009, 11:28 PM
Hey I guess I should have been more specific. I am testing water soluble coolants for the lathe and milling machine. No glycol testing here.

For the vitis vinifera (wine grapes) I test for sugar via Brix. For testing the coolant, Brix is used as well.

andy_b--

The highest specific gravity that I will test to is about 1.110 or 25.91 Brix. It looks like there are basically only two options for 0 and up readings. There are scales from 0-10 Brix and 0-32 Brix. I think that the only drawback to the 0-32 is that you loose a little accuracy but probably not enough to make any real difference.

HSS--

What brands are you using?

Thanks
Greebe

Glenn Wegman
10-31-2009, 11:34 PM
I had the same dilemma and was curious, so I bought both!

I use the 0-10 as the coolant I use likes to live at 5-7.

Greebe
11-01-2009, 01:48 AM
Have you ever tested them side by side to see if there is any difference in their readings?

Glenn Wegman
11-01-2009, 08:15 AM
I will when I get there today as I was going to tune up my coolant sumps anyway.

Glenn Wegman
11-01-2009, 05:36 PM
If you need the broad range, you will be fine with the 0 to 32. It's just graduated in slightly coarser increments , but the line is clearer so it is actually easier to read than the 0 to 10.

HSS
11-02-2009, 10:48 AM
HSS--

What brands are you using?

Thanks
Greebe

All of mine are Thermal Fluids Inc. (made in Chin-a) imagine that.

Glenn Wegman
11-02-2009, 10:59 AM
Have you ever tested them side by side to see if there is any difference in their readings?

Same reading on both.

Greebe
11-06-2009, 08:12 PM
Excellent. Thank you for taking the extra time to try that out.

I will go ahead and order on of the 0-32 versions.

Thanks
Greebe