FOCALCHECK MICROSPHER 0.5 ML，F14806，Invitrogen

The sharp ring stains exhibited by the 6.0 µm FocalCheck™ fluorescent green/orange/dark-red ring stained microspheres produce a striking visual representation of instrument misalignment or other aberrations making them ideal as reference standards for confocal laser-scanning microscopy. Correct image registration is indicated when the multiple ring images are perfectly coincident in all dimensions.