Micro-Tracers Rumensin Spot Counting App uses your smartphone camera to provide automated spot counts. The Spot Counting App is most accurate when used with a Light Box Setup available from Micro-Tracers, Inc. offices in San Francisco, CA. The Single Test Feature counts FS-Red #3/Natural Yellow spots of tracers recovered from samples containing Rumensin feed additives. The Multiple Test Feature calculates the Quality of Mixing Results using the Poisson distribution. Visit Microtracers.com for more information.