Hello,

refractometer, especially Abbe-refractometer, are used
to measure the refractive index of liquids.
http://en.wikipedia.org/wiki/Refractometer
I can not recommend a vendor. Just search the web and
you will find one in your country.

Best regards

Harald

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  HaWa-Con Consulting
  Switzerland
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> Hey all,
>
> Does anybody know what kind of instrument can be
> used to measure the refractive index of liquid?
> Which vendor and what products do you
> recommend for use?