I am looking for a source of supply for a Duo-Chek refractometer. The only one I can find is on Duo-Chek's web site, and I don't want to use a government credit card over the internet.

grainger has one for 121.20 p/n 3my56

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3my56

I checked it out and Grainger describes is as "Measures the Concentration of Sugar in Fruit Juice from 0 to 32% Brix, 0.2 Resolution" Thank you though.

I know you said duo-chek, but if you can compromise brand name, Lab Safety has a ton of other refractometers that should serve your purpose.

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you can also get refractometers for electrolyte through the stock system. I have the NSN at work just shoot me an email through global if you are interested. It stops the MKs from stealing it for antifreeze and losing dip sticks. The one I received was made by Snap-on