Hematology analyzers are used to run tests on blood samples. They are used in the medical field to do white blood cell counts, complete blood counts, reticulocyte analysis, and coagulation tests. There are hematology analyzers that are for human blood or animal blood, which is useful for veterinarians, zoos, and research labs. Features vary from one hematology analyzer to another, such as closed vial testing and open sampling testing. Certain hematology analyzers allow the user to choose the preferred testing type. The trainer is designed to demonstrate the operation, theory, repair and servicing of Hematology Analyzer h equipment that used at clinics & hospitals. The unit given the fault diagnosis so as to facilitate the teaching of trouble shooting techniques. A fault simulator is provided with circuit block diagram of the device for the students to study theoretically and experimentally in order to understand the operation of the device.