Abstract: A portable device for imaging a solid or fluid biological sample. The portable device accepts a wafer for carrying the biological sample. The portable device comprises a camera, and a casing which is configured to receive the wafer. The wafer is positioned inside the casing at an imaging location so that the camera can capture images of the sample. The portable device can also comprise a rotary driver to rotate the wafer between a series of orientations. Each orientation bringing a different area of the biological sample into a field of view of the camera.