diff --git a/src/fgt/edit_quality/eqhandle.h b/src/fgt/edit_quality/eqhandle.h
index b66fe593b..c58c44358 100644
--- a/src/fgt/edit_quality/eqhandle.h
+++ b/src/fgt/edit_quality/eqhandle.h
@@ -104,8 +104,10 @@ signals:
 
 private slots:
 	
-	void setXBySpinBoxValueChanged (double spinBoxValue); // changing equalizer spinboxes moves the connected handle
 	void moveMidHandle();
+
+public slots:
+	void setXBySpinBoxValueChanged (double spinBoxValue); // changing equalizer spinboxes moves the connected handle
 };
 
 #endif // EQHANDLE_H
\ No newline at end of file
diff --git a/src/fgt/edit_quality/qualitymapperdialog.cpp b/src/fgt/edit_quality/qualitymapperdialog.cpp
index f460d5a03..8313e97a1 100644
--- a/src/fgt/edit_quality/qualitymapperdialog.cpp
+++ b/src/fgt/edit_quality/qualitymapperdialog.cpp
@@ -63,6 +63,7 @@ QualityMapperDialog::QualityMapperDialog(QWidget *parent, MeshModel& m, GLArea *
 	_equalizer_histogram = 0;
 	for (int i=0; i<NUMBER_OF_EQHANDLES; i++)
 		_equalizerHandles[i] = 0;
+	_signalDir = UNKNOWN_DIRECTION;
 
 	//building default Transfer Function
 	_transferFunction = new TransferFunction( STARTUP_TF_TYPE );
@@ -341,6 +342,7 @@ bool QualityMapperDialog::initEqualizerHistogram()
 	// Connecting handles to spinboxes
 	connect(_equalizerHandles[LEFT_HANDLE],  SIGNAL(positionChangedToSpinBox(double)), ui.minSpinBox, SLOT(setValue(double)));
 	connect(_equalizerHandles[MID_HANDLE],   SIGNAL(positionChangedToSpinBox(double)), ui.midSpinBox, SLOT(setValue(double)));
+	connect(_equalizerHandles[MID_HANDLE],   SIGNAL(positionChangedToSpinBox(double)), this, SLOT(on_midSpinBox_valueChanged(double)));
 	connect(_equalizerHandles[RIGHT_HANDLE], SIGNAL(positionChangedToSpinBox(double)), ui.maxSpinBox, SLOT(setValue(double)));
 	
 	// Connecting left and right handles to mid handle
@@ -1340,4 +1342,37 @@ void QualityMapperDialog::setEqualizerParameters(EQUALIZER_INFO data)
 void QualityMapperDialog::on_brightnessSlider_valueChanged(int value)
 {
 	ui.brightessSpinBox->setValue((double)value/50.0);
+}
+
+void QualityMapperDialog::on_midSpinBox_valueChanged(double)
+{
+	if ( _signalDir != LABEL2SPINBOX )
+		ui.midPercentage->blockSignals( true );
+	QString val;
+	val.setNum( 100.0f * absolute2RelativeValf( ui.midSpinBox->value(), ui.maxSpinBox->value() - ui.minSpinBox->value() ), 'g', 4 );
+	ui.midPercentage->setText( val + "%" );
+	if ( _signalDir != LABEL2SPINBOX )
+		ui.midPercentage->blockSignals( false );
+
+	_signalDir = SPINBOX2LABEL;
+}
+
+void QualityMapperDialog::on_midPercentage_textEdited(QString newText)
+{
+	bool conversionPossible;
+	float numericValue = newText.toFloat(&conversionPossible);
+
+	if ( _signalDir != SPINBOX2LABEL )
+		ui.midSpinBox->blockSignals( true );
+	if ((conversionPossible) && (numericValue>=0) && (numericValue<=100) )
+	{
+		ui.midSpinBox->setValue( relative2AbsoluteValf(numericValue, ui.maxSpinBox->value() - ui.minSpinBox->value()) / 100.0f );
+		_equalizerHandles[MID_HANDLE]->setXBySpinBoxValueChanged(ui.midSpinBox->value());
+	}
+	else
+		QMessageBox::warning(this, tr("Wrong text value"), tr("The value inserted in the text area has a bad range value or is of a not compatible type"), QMessageBox::Ok); 
+	if ( _signalDir != SPINBOX2LABEL )
+		ui.midSpinBox->blockSignals( false );
+
+	_signalDir = LABEL2SPINBOX;
 }
\ No newline at end of file
diff --git a/src/fgt/edit_quality/qualitymapperdialog.h b/src/fgt/edit_quality/qualitymapperdialog.h
index 666bc35f6..243bb9351 100644
--- a/src/fgt/edit_quality/qualitymapperdialog.h
+++ b/src/fgt/edit_quality/qualitymapperdialog.h
@@ -100,6 +100,13 @@ public:
 #define GRAPHICS_ITEMS_LIST		QList<QGraphicsItem *>
 #define TF_HANDLES_LIST			QList<TFHandle*>
 
+enum MID_HANDLE_SIGNAL_DIRECTION
+{
+	UNKNOWN_DIRECTION = 0,
+	SPINBOX2LABEL,
+	LABEL2SPINBOX
+};
+
 //this class define the dialog of the plugin
 class QualityMapperDialog : public QDockWidget
 {
@@ -127,6 +134,7 @@ private:
 	bool			_leftHandleWasInsideHistogram;
 	bool			_rightHandleWasInsideHistogram;
 	GRAPHICS_ITEMS_LIST _equalizerHistogramBars;
+	MID_HANDLE_SIGNAL_DIRECTION	_signalDir;
 
 	//Transfer Function items
 	TransferFunction *_transferFunction;
@@ -170,6 +178,8 @@ signals:
 	void closingDialog();
 
 private slots:
+	void on_midPercentage_textEdited(QString);
+	void on_midSpinBox_valueChanged(double);
 	void on_brightnessSlider_valueChanged(int);
 	void on_clampButton_clicked();
 	void on_ySpinBox_valueChanged(double);
diff --git a/src/fgt/edit_quality/qualitymapperdialog.ui b/src/fgt/edit_quality/qualitymapperdialog.ui
index cb4538846..a0f5c14eb 100644
--- a/src/fgt/edit_quality/qualitymapperdialog.ui
+++ b/src/fgt/edit_quality/qualitymapperdialog.ui
@@ -534,7 +534,7 @@
               </property>
               <property name="sizeHint" >
                <size>
-                <width>40</width>
+                <width>16</width>
                 <height>20</height>
                </size>
               </property>
@@ -553,6 +553,13 @@
               </property>
              </widget>
             </item>
+            <item>
+             <widget class="QLineEdit" name="midPercentage" >
+              <property name="text" >
+               <string>%</string>
+              </property>
+             </widget>
+            </item>
             <item>
              <spacer>
               <property name="orientation" >
@@ -560,7 +567,7 @@
               </property>
               <property name="sizeHint" >
                <size>
-                <width>40</width>
+                <width>16</width>
                 <height>20</height>
                </size>
               </property>