Sharp Calculator 10 Digit Model EL506 – Electronix Express
Amazon.com : Sharp EL-531TGBBW 12-Digit Scientific/Engineering Calculator with Protective Hard Cover, Battery and Solar Hybrid Powered LCD Display, Great for Students and Professionals, Black,Black and White : Office Products
SHARP EL-506WB (EL506WB) Scientific calculator | FARANANI Electronic Products South Africa