Texas Instruments TI-1890 Converter

This interesting machine based on a TI-35 is really a converter. Giving the US citizens a chance to work with the International SI units, it converts easily between old-fashioned yards, inches, gallons and ounces to the modern meters, centimeters, liters or grams. The TI Converter has 194 built-in conversions and was delivered together with the "Calculator and Converter handbook" that guides step-by-step through common household and work related projects.