LEDs in the BYK-Gardner spectro-guide.
Photo Courtesy of BYK-Gardner.

Every year or so, it comes time to send in your instrumentation to be calibrated per your quality control protocols.  You receive your instrument back along with a traceable certificate.  Or, you may even have a Field Service Engineer visit you on-site to calibrate and certify your instruments.  But, that certificate that you hold in your hand, that you file away, what does it mean for you?