Orpat OT-555T/555GT Check and Correct Calculator Are you looking out for a calculator which will help you to solve all your basic math problems such as addition, subtraction, division and multiplication? If you are, then this calculator by Orpat will definitely suffice. Orpat brings to you this OT 555 T basic calculator which comes with standard keys so that you can easily type in your numbers. This basic calculator comes with a plastic casing and is also equipped with an 8 digit display to give you a clear view of all the numbers. In addition, this OT 555 T basic calculator is powered by a battery to compute all your math problems at high speeds. Add this OT 555 T basic calculator to your shopping cart and ease the process of calculating all your math problems.