Fluorophore-labeled microspheres offer a convenient means to check general instrument status and monitor stability over time. When beads are run, the median channel values for pertinent fluorescence detectors are recorded, and data are monitored to identify outliers and trends. This type of check can alert the user to problems with the optical and fluidic systems (e.g. diminishing laser power or obstruction / leakage) and the effect of environmental factors such as temperature, humidity, and vibration on instrument performance.nUltra Rainbow Fluorescent Particles (by Spherotech™) are internally labeled with multiple fluorophores. Quantum QC is an 8-peak, multi-intensity, multi-fluorescent standard that is intended for use as an in-depth tool for daily cytometer QC. Full Spectrum microspheres provide a convenient means for performing the initial daily QC check on 3+ color instruments.nEach standard consists of a population of microspheres surface labeled with a single fluorochrome at a high intensity level. The Right Reference Standard™ microspheres approximate the size of human lymphocytes (~7-9µm). With their narrow fluorescence CVs, Right Reference Standard™ products are suitable for alignment purposes. These standards may also be used to QC a specific path of the optical system (laser/filter/PMT), and to establish a unified fluorescence range for a particular detector.nSingle-color Fluorescence Reference Standards for flow cytometry are highly uniform microspheres labeled with dyes / stains often used in flow cytometric assays, cell cycle analysis, or fluorescence-based cell viability determinations. The standards are compatible with instrument QC, optimization of filter sets and optical systems, as well as, controls for research & development imaging workflows.