Casio fx-991MS S-V.P.A.M. scientific calculators designed for advanced mathematics and engineering students. These two-way power units feature a clear two-line display and a slide-on hard case with a built-in quick reference guide for scientific constants and unit conversions. Ideal for high school and college coursework, these calculators handle complex calculations, statistics, and equation solving with ease. Please note that while one unit is fully operational, the second unit has a weak internal battery that needs replacing and requires a consistent light source for the solar panel to maintain power. Both units show signs of previous use including surface scuffs and scratches on the exterior housings.

Please review all photos carefully, as they are part of the item description and condition. Any notable flaws will be disclosed and photographed. Feel free to contact me with any questions before purchasing. Items are packaged securely and shipped promptly.