In Costa Rica, metric system has been adopted since 1910, and has been compulsory since 1912, by a joint convention among Costa Rica, Guatemala, Honduras, Nicaragua and Salvador.
[1][2] Before the metric system, a number of modified Spanish (i.e., Spanish Castilian[2]), English and local units were used.
Several units were used to measure mass in Costa Rica, Guatemala, Honduras, Nicaragua, and El Salvador.
[3] Several units were used to measure area in Costa Rica, Guatemala, Honduras, Nicaragua, and El Salvador.
[1][2] Several units were used to measure capacity in Costa Rica, Guatemala, Honduras, Nicaragua, and El Salvador.