diff --git a/debye_bec/bec_widgets/widgets/digital_twin/digital_twin.py b/debye_bec/bec_widgets/widgets/digital_twin/digital_twin.py
index 2a5b9fd..7e2b163 100644
--- a/debye_bec/bec_widgets/widgets/digital_twin/digital_twin.py
+++ b/debye_bec/bec_widgets/widgets/digital_twin/digital_twin.py
@@ -16,6 +16,11 @@ from qtpy.QtWidgets import (
     QHBoxLayout,
     QApplication,
     QLayout,
+    QMessageBox,
+    QLabel,
+    QDialog,
+    QPushButton,
+    QStyle,
 )
 # pylint: disable=E0611
 from qtpy.QtCore import (
@@ -76,6 +81,9 @@ class DigitalTwin(BECWidget, QWidget):
         super().__init__(parent=parent, theme_update=True, *arg, **kwargs)
         self.get_bec_shortcuts()
 
+        # Check if devices are all in config
+        self.check_config()
+
         central = QWidget()
         self.root_layout = QHBoxLayout(central)
 
@@ -142,6 +150,84 @@ class DigitalTwin(BECWidget, QWidget):
         self.surface_plots.apply_theme(theme)
         self.mover.apply_theme(theme)
 
+    def check_config(self):
+        devices = [
+            'abs',
+            'sldi_gapx',
+            'sldi_gapy',
+            'cm_trx',
+            'cm_try',
+            'cm_bnd_radius',
+            'cm_rotx',
+            'mo1_bragg',
+            'mo1_trx',
+            'mo1_try',
+            'sl1_centery',
+            'sl1_gapy',
+            'bm1_try',
+            'fm_trx',
+            'fm_try',
+            'fm_bnd_radius',
+            'fm_rotx',
+            'fm_roty',
+            'fm_rotz',
+            'sl2_centery',
+            'sl2_gapy',
+            'bm2_try',
+            'ot_try',
+            'ot_rotx',
+            'es0wi_try',
+            'ot_es1_trz',
+        ]
+        while True:
+            missing = [d for d in devices if d not in self.dev]
+            if not missing:
+                break
+            dialog = QDialog()
+            dialog.setWindowTitle("Digital Twin - Config Check")
+            dialog.setFixedWidth(400)
+            layout = QVBoxLayout()
+
+            top = QHBoxLayout()
+            icon = QLabel()
+            icon_pixmap = QApplication.style().standardIcon(
+                QStyle.SP_MessageBoxWarning
+            ).pixmap(48, 48)
+            icon.setPixmap(icon_pixmap)
+            icon.setAlignment(Qt.AlignTop)
+            top.addWidget(icon)
+
+            text = QLabel(
+                "The current config does not include all required devices to run Digital Twin." +
+                "Reload the config with the correct devices."
+            )
+            text.setWordWrap(True)
+            text.setAlignment(Qt.AlignTop)
+            top.addWidget(text, stretch=1)
+            layout.addLayout(top)
+
+            info = QLabel("Missing devices:\n" + ", ".join(missing))
+            info.setWordWrap(True)
+            info.setAlignment(Qt.AlignTop)
+            layout.addWidget(info)
+            layout.addStretch()
+
+            buttons = QHBoxLayout()
+            check_again = QPushButton("Check Again")
+            close_app   = QPushButton("Close Application")
+            check_again.clicked.connect(dialog.accept)
+            close_app.clicked.connect(dialog.reject)
+            buttons.addWidget(check_again)
+            buttons.addWidget(close_app)
+            layout.addLayout(buttons)
+
+            dialog.setLayout(layout)
+            dialog.show()
+            info.setMinimumHeight(info.heightForWidth(info.width()))
+            if dialog.exec_() == QDialog.Rejected:
+                QApplication.instance().exit(0)
+                sys.exit(0)
+
     @SafeSlot()
     def calc_assistant(self, *args, **kwargs):
         identifier = kwargs['identifier']
@@ -226,6 +312,8 @@ class DigitalTwin(BECWidget, QWidget):
         return config
 
     def get_reality_config(self):
+        # Assure all devices are in the config
+        self.check_config()
         mo1_trx = self.dev.mo1_trx.read(cached=True)['mo1_trx']['value']
         if abs(mo1_trx) > 5:
             mo1_mode = 'Monochromatic'