Bresser Phase Contrast set for Science. Bright and dark areas will be intensified. The background remains bright. Specifications for Bresser Phase Contrast Set for Science IVM-401: Manufacturer: Bresser Additional Features: Phase contrast set suitable for microscope SCIENCE IVM-401 Magnification: 25 - 40 x Magnification Type: Variable Package Contents: Bresser Phase Contrast Set for Science IVM-401 Bresser 5942760: Phase Contrast set for Science