diff --git a/gui/include/Visualization/VisualizationGraphWidget.h b/gui/include/Visualization/VisualizationGraphWidget.h
index c935e8e..49f5503 100644
--- a/gui/include/Visualization/VisualizationGraphWidget.h
+++ b/gui/include/Visualization/VisualizationGraphWidget.h
@@ -96,6 +96,8 @@ public:
     void move(double dx, double dy, bool forward = true);
     void transform(const DateTimeRangeTransformation& tranformation, bool forward = true);
 
+    void toggle_y_log_scale();
+
     // IVisualizationWidget interface
     void accept(IVisualizationWidgetVisitor* visitor) override;
     bool canDrop(Variable2& variable) const override;
diff --git a/gui/src/Visualization/VisualizationGraphWidget.cpp b/gui/src/Visualization/VisualizationGraphWidget.cpp
index a68f8fd..748037e 100644
--- a/gui/src/Visualization/VisualizationGraphWidget.cpp
+++ b/gui/src/Visualization/VisualizationGraphWidget.cpp
@@ -417,6 +417,21 @@ struct VisualizationGraphWidget::VisualizationGraphWidgetPrivate
             setRange(axis->range());
         m_plot->replot(QCustomPlot::rpQueuedReplot);
     }
+    void toggle_y_log_scale()
+    {
+        if(m_plot->yAxis->scaleType()==QCPAxis::stLinear)
+        {
+            m_plot->yAxis->setScaleType(QCPAxis::stLogarithmic);
+            QSharedPointer<QCPAxisTickerLog> logTicker(new QCPAxisTickerLog);
+            m_plot->yAxis->setTicker(logTicker);
+        }
+        else
+        {
+            m_plot->yAxis->setScaleType(QCPAxis::stLinear);
+            QSharedPointer<QCPAxisTicker> ticker(new QCPAxisTicker);
+            m_plot->yAxis->setTicker(ticker);
+        }
+    }
 };
 
 VisualizationGraphWidget::VisualizationGraphWidget(const QString& name, QWidget* parent)
@@ -679,6 +694,11 @@ void VisualizationGraphWidget::transform(
         emit this->setrange_sig(this->graphRange(), true, false);
 }
 
+void VisualizationGraphWidget::toggle_y_log_scale()
+{
+    impl->toggle_y_log_scale();
+}
+
 void VisualizationGraphWidget::accept(IVisualizationWidgetVisitor* visitor)
 {
     if (visitor)
@@ -1140,6 +1160,9 @@ void VisualizationGraphWidget::keyPressEvent(QKeyEvent* event)
                 zoom(2, this->height() / 2, Qt::Vertical);
             }
             break;
+        case Qt::Key_L:
+            toggle_y_log_scale();
+            break;
         default:
             QWidget::keyPressEvent(event);
             break;