Microplate Photometer HiPo MPP-96 is a compact tabletop device for measuring the results of ELISA and microbiological studies in 96-well microplates. The photometer is controlled and outputs data via a computer. A microplate reader is a laboratory instrument that is used to measure chemical, biological or physical reactions, properties, and analytes within the well of a microplate. A microplate consists of small wells in which separated reactions take place. These reactions convert the presence of an analyte or the progression of biochemical processes into optical signals. The microplate reader detects these signals and thus quantifies the parameter of interest.