Mettler Toledo WMC Serie Guide De L'utilisateur page 9

In operation, the weigh unit is rated IP30. If the wash-down module is mounted on the top (available as an
accessory), an enhanced IP rating of IP54 can be reached during operation.
The electronic unit meets IP40.
The SWT terminal is rated IP54.
If the wash-down module is mounted on the top (available as an accessory), an enhanced IP rating of IP56
can be reached in wash-down configuration (weighing not possible).
Weigh Modules Operation​ ​ 9