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Note: All new TI-84 Plus calculators are already equipped with a plastic cover. Please buy our product with this in mind. Thank you for purchasing from EZ Graphing! Find your calculator from anywhere in the room! EZ Graphing Slide cases are the only patented sliding cover on the market that offers functionality of a calculator cover. Say "hello" to beautiful lines with the EZ Graphing Slide Case for the TI-84 (‡ all models except Plus CE) and TI-89 Titanium Calculator. Keep a straight edge wherever you bring your calculator! Featuring a 6-inch side ruler, a 6-centimeter top ruler, an XY axis template that reduces time chart axes, and 12 math functions that are important to any mathematician (middle school to college). The XY axis template can not only help you with graphics, but also draw perfect rectangles, 3-4-5 right angle triangles, isosceles triangles, parallel lines and much more. Ideal for geometry, algebra, precalculus and calculus classes. Please visit the Product Features tab on the ezgraphing website for geometry instructions. Each slide sleeve is made in the USA