Hello, Abbe refractometers are common instruments used to measure the refractive index of liquids. A web search will provide a list of vendors. Cheers! Chris Bliss -----Original Message----- From: Peng Li (Paul) [mailto:lip@egr.uri.edu] Sent: March 19, 2007 11:55 AM To: mems-talk@memsnet.org Subject: [mems-talk] measure refractive index 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?