This letter serves as a reference for the calibration services rendered by Kimberly Malone of CLC Calibration. I first met Kimberly Malone in my duties as Laboratory Manager at ZenBio, Inc. in 2002 in which I was impressed by her attention to detail, professionalism , personable nature and dedication to the job. Once she introduced her new company, CLC Calibration, the decision to use her calibration and repair services was a simply one. In 2008, we transitioned our laboratory to becoming a certified GLP facility. The use of CLC Calibration’s services has made the GLP equipment paperwork tracking and management process easier to handle. In my 13 years managing the calibration services for ZenBio, I highly recommend the calibration services of CLC Calibration and have frequently offered my rare recommendation to other laboratories across the country seeking a new calibration service provider. Since 2009, CLC Calibration has been and continues to be our preferred provider for calibration and pipet instrument repair services.