How to set Decimal Places on the Sharp EL-531 Scientific Calculator - YouTube
Virtual Museum of Calculators
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
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
Use of the Fraction Key on the Sharp EL 531X Calculator - YouTube