If you sell items such as bulk candy by the hectogram, or alcoholic beverages by the centilitre, it can be useful to specify the exact amount the customer wishes to buy. This can easily be enabled for your items in Backoffice.
Here's how:
When creating or editing an item under Products (Products menu option), tick the Open quantity box. The checkout will then automatically ask how many hectograms, centilitres - or the unit of your choice - the customer wants.
Don't forget to also select the correct Unit before saving the item.
Press save.