Unit Conversions provides proper labelling for inventory that you sell in units that are different then how you purchase them. For example, if you purchase a product that comes in a case of 12 but you sell them individually. It can also be used to simply change the unit label that is displayed on the work order. By default, the software uses a unit conversion of unit for unit. All inventory, unless otherwise configured using a unit conversion, is purchased in units and sold in units. So if you sell engine oil on a work order, by default it will read 3.8 units. If you wanted the label to read liters or quarts instead then you would set up a unit conversion for it.
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