diff --git a/src/atcore.h b/src/atcore.h
--- a/src/atcore.h
+++ b/src/atcore.h
@@ -53,6 +53,10 @@
     E = 1 << 3,
 };
 
+enum MeasurementUnits {
+	METRIC, IMPERIAL
+};
+
 //TODO: PrinterStatus should also move to d->pointer;
 struct KATCORE_EXPORT PrinterStatus {
     float percentage;
@@ -265,6 +269,12 @@
      */
     void showMessage(const QString &message);
 
+    /**
+     * @brief setUnits sets the measurement units do be used
+     * @param system : the measurement units (METRIC / IMPERIAL)
+     */
+    void setUnits(MeasurementUnits units);
+
 private slots:
     /**
      * @brief processQueue send commands from the queue.
diff --git a/src/atcore.cpp b/src/atcore.cpp
--- a/src/atcore.cpp
+++ b/src/atcore.cpp
@@ -517,3 +517,13 @@
         pushCommand(GCode::toCommand((GCode::M117), message));
     }
 }
+
+void AtCore::setUnits(MeasurementUnits units)
+{
+    switch (units) {
+        case METRIC:
+            pushCommand(GCode::toCommand(GCode::G21));
+        case IMPERIAL:
+            pushCommand(GCode::toCommand(GCode::G20));
+    }
+}