To whom it may concern:
    My name is Russell Mueller and am a Masters student in Animal
Science at Oklahoma State University.  My research project entails
trying to develop a radiotelemetry pH sensor that will measure hind-gut
pH in Horses feed varying pH  affecting diets.  We are having
difficulties finding a sensor that will fit in a capsule about 1 inch
long and a diamter of 3/4 of an inch.  If you have any information,
ideas, or products on the market, your help would be greatly
appreciated.  Thank you.
Russell Mueller
205 Poultry Science
Oklahoma State University
Stillwater OK 74078
(405) 744-7783