Micron's Phase Contrast Attachment is an advanced optical system that converts a standard brightfield microscope into a powerful tool for observing transparent, unstained specimens. Phase contrast works by translating minute differences in the refractive index and thickness of a specimen into visible differences in brightness. This technique is widely regarded as one of the best methods for observing living cells and other transparent biological materials without staining. The attachment typically consists of two main components: a specialized phase condenser containing annulus plates, and a set of phase objectives containing a phase ring. When aligned, these components interfere with the light passing through the specimen, creating a high-contrast image. This is one of the best investments for a life science laboratory, as it dramatically expands the microscope's utility.