Tested and working. This Casio Fx-250HC Fraction Scientific Calculator is a reliable tool that has been tested and is fully functional. Its regular-sized display and key size make it easy to use, while its battery power source ensures you can take it with you wherever you go. This calculator is perfect for business and industrial use, as well as for office equipment needs. With its brand name of Casio and its specific model number of Fx-250HC, you can trust that this calculator will provide accurate and dependable results for your calculations. Whether you're a student, a professional, or simply need a calculator for personal use, the Casio Fx-250HC is a great choice. Get yours today and start crunching those numbers! *60 day, no questions asked return policy. *As a TOP RATED PLUS seller, I provide some of the best customer service and satisfaction . *I pack all orders with great care and provide next day shipping to ensure safe and timely arrival of your goods. *Electronics are shipped without batteries unless otherwise noted. *If something arrives and is not to your satisfaction, please let me know and I will make it right. Customer service is my highest priority. *I like to give fast and positive feedback and try to do so upon receipt of payment. *Thank you for your business! You are very much appreciated.