In this project is shown development and application of Relational Database for Android operating system in an industrial environment. In a theoretical part is described what Relational Database and system for managing it (Relational Database Management System) are. In the project is also analized the Relational Database that has been used – SQLite and its features. Then the programs and tools that were used during the making of the mobile application are listed and is also shown the procedure for installing them. An Android project is created; class for inserting data in the database, data retrieval, updating data and deleting data from the databse and design of the application. Purpose of the application is inserting the results of diagnostic tests from electrical machines in the created mobile database and also displaying the generated results from CSV (Comma-separated values) files. Therefore, the application gives the possibility of inserting serial number of the machine, current value and voltage value. In the developed application there is also the option to update the data using the identification number (ID) which is assigned at each insertion. If, from some reason, there is a need to delete the data, that option is also available. Of course, there is always a room for improvement. In this particular case an improvement can be carried out by adding the posibility for inserting other parameters (e.g. engine rotation speed), by implementing an option for listing the data out based on one or several parameters, and adding an option to save the inserted results in the CSV file.