We've joined in the critical fight against breast cancer with our "Pink" E-Z grader. For each "Pink" sold, E-Z Grader donates partial proceeds. It's durable enough to withstand the battles of classroom instruction, and powerful enough to calculate grade percentages for up to 95 problems! This is a must have for all teachers! Purchase one for home and one for your classroom. Sold as a pack of 3 E-Z Graders.