UnitConvert is a simple unit conversion tool developed by Ants Tech, and is capable of 38 different conversion categories, with many conversions available inside those categories.

Here are the install files for Vernier DataPro 1.70, updater to 1.71 included; and 1.3. The first zip provided is just .prc and .pdb files for 1.7x, the second is a Windows installer which may or may not work, the third is just the .prc and .pdb files ...