Color Graphing Calculator from Casio. Each unit is blue and is labeled "School Property" at the top.
PRIZM is revolutionary among graphing calculators with features that enhance users understanding of mathematics. With conventional graphing calculators, students learn by inputting equations to create graphs. PRIZM creates a whole new way to learn math by enabling students to experiment by creating their own graphs over pictures of real-life scenes, and then understand the functions from the graphs that they created on their own.