The phase contrast and brightfield microscopes provide options for observing live cells depending on your applications. A complete set of phase contrast kit can be flexibly equipped with ordinary biological microscope to be a phase contrast microscope system. The phase contrast microscope can improve the images of transparent and colorless objects, which are hard to see or invisible in an ordinary microscope. The brightfield compound microscopy offers four levels of magnification from 40X to 1000X. The phase contrast kit includes a phase contrast NA1.25 condenser, a centering telescopic eyepiece, three achromatic phase contrast objectives with phase plate: 10X, 40X, 100X. The phase contrast biological microscope offers three levels of magnification: 100X-400X-1000X. This type of microscopy is widely used in universities and life science professionals.