More on Amazon.com : http://www.amazon.com/gp/product/B001E65RKW?tag=thefatkidin06-20

Canon WS1400H 14-Digit LCD Compact Desktop Calculator

Large key tops help ensure accurate entries
Conversion key roll-over system for quick entry
00 and 000 keys for faster calculations
Dual solarbattery power for operation in any lighting
Auto power off