Barry: We use Rainbow beads for calibrating our He/Ne, UV and 488 lasers simultaneously; however, these 'Rainbow' beads are manufacutred by Spherotech Inc. in Libertyville, IL (telephone 1-800-368-0822). Perhaps Pharmingen is marketing the same beads or have some with a similar sounding name. Anyway, the Rainbow beads work well for calibration in that they are quite bright on the UV and He/Ne. The only partial problem is that the CV's while good, are not as tight as one might want for DNA calibration. -- Wayne Green wgreen@genetics.utah.edu
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