(1) The International System of Units as defined in Schedule 1 shall be the legal units of measurement of Saint Lucia.
(2) The units indicated in Part 1 of Schedule 2 may be used with SI units, because of their practical importance, wide usage or use in specialised fields.
(3) The Minister may by order appoint a date from or after which the units specified in Part 1 of Schedule 2 shall cease to have legal force and validity in Saint Lucia and the Minister may appoint different dates for different undertakings or class of undertakings specified in the order.
(4) The British Imperial System of units as defined in Part 2 of Schedule 2 may also be used concurrently with the International Systems of Units.
(5) The Minister may, by order, appoint a date from and after which the system of units mentioned in Part 2 of Schedule 2 shall cease to have legal force and validity in Saint Lucia and the Minister may appoint different dates for different undertakings or class of undertakings, specified in the order.