diff --git a/src/Mod/Fem/Gui/Resources/ui/MeshRegion.ui b/src/Mod/Fem/Gui/Resources/ui/MeshRegion.ui
index 5e646e3d03..99929c556b 100644
--- a/src/Mod/Fem/Gui/Resources/ui/MeshRegion.ui
+++ b/src/Mod/Fem/Gui/Resources/ui/MeshRegion.ui
@@ -39,39 +39,21 @@
          </widget>
         </item>
         <item row="1" column="1">
-         <widget class="Gui::InputField" name="if_elelen">
-          <property name="sizePolicy">
-           <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-            <horstretch>0</horstretch>
-            <verstretch>0</verstretch>
-           </sizepolicy>
-          </property>
-          <property name="minimumSize">
-           <size>
-            <width>80</width>
-            <height>20</height>
-           </size>
-          </property>
-          <property name="text">
-           <string>0 mm</string>
+         <widget class="Gui::QuantitySpinBox" name="qsb_elelen">
+          <property name="unit" stdset="0">
+           <string>mm</string>
           </property>
           <property name="alignment">
-           <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+           <set>Qt::AlignLeft|Qt::AlignTrailing|Qt::AlignVCenter</set>
           </property>
           <property name="singleStep">
            <double>1.000000000000000</double>
           </property>
-          <property name="maximum">
-           <double>1000000000.000000000000000</double>
-          </property>
-          <property name="unit" stdset="0">
-           <string notr="true">mm</string>
-          </property>
-          <property name="decimals" stdset="0">
-           <number>2</number>
+          <property name="minimum">
+           <double>0.000000000000000</double>
           </property>
           <property name="value" stdset="0">
-           <double>0.000000000000000</double>
+           <double>0.0000000000000</double>
           </property>
          </widget>
         </item>
@@ -97,9 +79,9 @@
  </widget>
  <customwidgets>
   <customwidget>
-   <class>Gui::InputField</class>
-   <extends>QLineEdit</extends>
-   <header>Gui/InputField.h</header>
+   <class>Gui::QuantitySpinBox</class>
+   <extends>QWidget</extends>
+   <header>Gui/QuantitySpinBox.h</header>
   </customwidget>
  </customwidgets>
  <resources/>
diff --git a/src/Mod/Fem/femtaskpanels/task_mesh_region.py b/src/Mod/Fem/femtaskpanels/task_mesh_region.py
index 9dcf33ee67..d433e3704a 100644
--- a/src/Mod/Fem/femtaskpanels/task_mesh_region.py
+++ b/src/Mod/Fem/femtaskpanels/task_mesh_region.py
@@ -47,11 +47,11 @@ class _TaskPanel(base_femtaskpanel._BaseTaskPanel):
         super().__init__(obj)
 
         # parameter widget
-        self.parameterWidget = FreeCADGui.PySideUic.loadUi(
+        self.parameter_widget = FreeCADGui.PySideUic.loadUi(
             FreeCAD.getHomePath() + "Mod/Fem/Resources/ui/MeshRegion.ui"
         )
         QtCore.QObject.connect(
-            self.parameterWidget.if_elelen,
+            self.parameter_widget.qsb_elelen,
             QtCore.SIGNAL("valueChanged(Base::Quantity)"),
             self.elelen_changed,
         )
@@ -59,26 +59,29 @@ class _TaskPanel(base_femtaskpanel._BaseTaskPanel):
 
         # geometry selection widget
         # start with Solid in list!
-        self.selectionWidget = selection_widgets.GeometryElementsSelection(
+        self.selection_widget = selection_widgets.GeometryElementsSelection(
             obj.References, ["Solid", "Face", "Edge", "Vertex"], True, False
         )
 
         # form made from param and selection widget
-        self.form = [self.parameterWidget, self.selectionWidget]
+        self.form = [self.parameter_widget, self.selection_widget]
 
     def accept(self):
         self.obj.CharacteristicLength = self.elelen
-        self.obj.References = self.selectionWidget.references
-        self.selectionWidget.finish_selection()
+        self.obj.References = self.selection_widget.references
+        self.selection_widget.finish_selection()
         return super().accept()
 
     def reject(self):
-        self.selectionWidget.finish_selection()
+        self.selection_widget.finish_selection()
         return super().reject()
 
     def init_parameter_widget(self):
         self.elelen = self.obj.CharacteristicLength
-        self.parameterWidget.if_elelen.setText(self.elelen.UserString)
+        FreeCADGui.ExpressionBinding(self.parameter_widget.qsb_elelen).bind(
+            self.obj, "CharacteristicLength"
+        )
+        self.parameter_widget.qsb_elelen.setProperty("value", self.elelen)
 
     def elelen_changed(self, base_quantity_value):
         self.elelen = base_quantity_value