CalCheck is a convenient and reusable LED device used to quickly and reliably verify the calibration of a Hygiena® luminometer. Simply insert CalCheck into a Hygiena luminometer and run a test in seconds. While the Hygiena luminometer runs a calibration self-check at startup, CalCheck provides validation and supports a robust quality control program. CalCheck provides an all-in-one, reusable positive and negative calibration verification device, activated simply by the click of a button.