diff --git a/plot.cpp b/plot.cpp
--- a/plot.cpp
+++ b/plot.cpp
@@ -17,8 +17,8 @@
   along with serialplot.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <QRectF>
 #include "plot.h"
-
 Plot::Plot(QWidget* parent) :
     QwtPlot(parent),
     zoomer(this->canvas(), false),
@@ -31,6 +31,9 @@ Plot::Plot(QWidget* parent) :
     zoomer.setZoomBase();
     grid.attach(this);
 
+    rectItem.setRect(QRectF(0,0,100,1));
+    // rectItem.attach(this);
+
     darkBackground(false);
 }
 
diff --git a/plot.h b/plot.h
--- a/plot.h
+++ b/plot.h
@@ -22,6 +22,7 @@
 
 #include <qwt_plot.h>
 #include <qwt_plot_grid.h>
+#include <qwt_plot_shapeitem.h>
 #include "zoomer.h"
 #include "scalezoomer.h"
 
@@ -39,6 +40,7 @@ private:
     Zoomer zoomer;
     ScaleZoomer sZoomer;
     QwtPlotGrid grid;
+    QwtPlotShapeItem rectItem;
 
     void resetAxes();
 
diff --git a/scalezoomer.cpp b/scalezoomer.cpp
--- a/scalezoomer.cpp
+++ b/scalezoomer.cpp
@@ -28,10 +28,35 @@ ScaleZoomer::ScaleZoomer(QwtPlot* plot, 
 {
     _plot = plot;
     _zoomer = zoomer;
+    connect(&bottomPicker, &ScalePicker::pickStarted, this, &ScaleZoomer::bottomPickStarted);
+    connect(&bottomPicker, &ScalePicker::picking, this, &ScaleZoomer::bottomPicking);
     connect(&bottomPicker, &ScalePicker::picked, this, &ScaleZoomer::bottomPicked);
     connect(&leftPicker, &ScalePicker::picked, this, &ScaleZoomer::leftPicked);
 }
 
+void ScaleZoomer::bottomPickStarted(double firstPos)
+{
+    double yMin = _plot->axisScaleDiv(QwtPlot::yLeft).lowerBound();
+    double yMax = _plot->axisScaleDiv(QwtPlot::yLeft).upperBound();
+    rectShape.setRect(QRectF(firstPos, yMin, 2, yMax-yMin));
+    rectShape.attach(_plot);
+    _plot->replot();
+}
+
+void ScaleZoomer::bottomPicking(double firstPos, double lastPos)
+{
+    double yMin = _plot->axisScaleDiv(QwtPlot::yLeft).lowerBound();
+    double yMax = _plot->axisScaleDiv(QwtPlot::yLeft).upperBound();
+    if (lastPos > firstPos) {
+        rectShape.setRect(QRectF(firstPos, yMin, lastPos-firstPos, yMax-yMin));
+    }
+    else
+    {
+        rectShape.setRect(QRectF(lastPos, yMin, firstPos-lastPos, yMax-yMin));
+    }
+    _plot->replot();
+}
+
 void ScaleZoomer::bottomPicked(double firstPos, double lastPos)
 {
     QRectF zRect;
@@ -49,6 +74,8 @@ void ScaleZoomer::bottomPicked(double fi
     zRect.setBottom(_plot->axisScaleDiv(QwtPlot::yLeft).lowerBound());
     zRect.setTop(_plot->axisScaleDiv(QwtPlot::yLeft).upperBound());
     _zoomer->zoom(zRect);
+    rectShape.detach();
+    _plot->replot();
 }
 
 void ScaleZoomer::leftPicked(double firstPos, double lastPos)
diff --git a/scalezoomer.h b/scalezoomer.h
--- a/scalezoomer.h
+++ b/scalezoomer.h
@@ -23,6 +23,7 @@
 #include <QObject>
 #include <qwt_plot.h>
 #include <qwt_plot_zoomer.h>
+#include <qwt_plot_shapeitem.h>
 
 #include "scalepicker.h"
 
@@ -39,9 +40,12 @@ private:
     ScalePicker bottomPicker;
     ScalePicker leftPicker;
 
+    QwtPlotShapeItem rectShape;
 
 private slots:
+    void bottomPickStarted(double firstPos);
     void bottomPicked(double firstPos, double lastPos);
+    void bottomPicking(double firstPos, double lastPos);
     void leftPicked(double firstPos, double lastPos);
 };