Download WooCommerce Unit Of Measure
This plugin is available from wordpress.org, download.
WooCommerce Unit Of Measure allows you to add a unit of measure (UOM), or any text you require after the price in WooCommerce. You can add as many different labels after the price as you like with the input field on the product page, just under the price field. You can even use popular product import tools by adding the custom column, meta:_woo_uom_input, to do a unit of measure after the price in bulk.
Screenshots to follow.