NeoCal for Palm OS User Guide
The conversions are divided into six types: length, area, volume, speed, weight, and temperature. The conversion buttons are pressed to either assign a unit (when the number does not have a unit, or the unit is not of the same type) or convert to another unit of the same type. In either case, the units assigned to the number are the same as the button.
The conversions are separated into two function groups with the Length, Area, and Speed conversions in the first group and the Volume, Weight (or Mass), and Temperature conversions in the second group. In addition, duration conversions are available in the Date & Time function group and discussed in the Date and Time Functions section.