Advances in technology today are very helpful for humans in completing work. Radio Frequency Identification (RFID) is one of the new technologies that has developed rapidly. By using RFID and entering an RFID tag in every book in the library, the process of borrowing and returning books will be easier by scanning the books with an RFID reader and entering them into the database. The ULI (UNSIKA Library) application is an application which is designed as a liaison between the user and the admin (library staff) in conducting borrowing transactions or returning books in the library. This application can be used by users as a medium for ordering books (booking), checking a list of borrowed books and returning books. ULI scanner tool is used as a confirmation medium for borrowing and returning books to be borrowed or returned by the user through the ULI application. The RFID (Radio Frequency Identification) sensor test shows that the sensor can detect RFID tags well. The overall tool system testing shows that the tool can carry out its mission, namely detecting book IDs using RFID. Based on the measurement results, Telkomsel's data access speed is superior with the fastest data access reading of 1.85 seconds while Indosat is 3.50 seconds and the average data access reading on Telkomsel is 2.2 seconds and Indosat is 6.7 seconds.
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