diff --git a/Software/PC_Application/Application.pro b/Software/PC_Application/Application.pro
index 28a273d..4afcd2e 100644
--- a/Software/PC_Application/Application.pro
+++ b/Software/PC_Application/Application.pro
@@ -123,3 +123,5 @@ RESOURCES += \
     icons.qrc
 
 CONFIG += c++14
+REVISION = $$system(git rev-parse HEAD)
+DEFINES += GITHASH=\\"\"$$REVISION\\"\"
diff --git a/Software/PC_Application/Calibration/calibration.cpp b/Software/PC_Application/Calibration/calibration.cpp
index dc62c9f..5849d77 100644
--- a/Software/PC_Application/Calibration/calibration.cpp
+++ b/Software/PC_Application/Calibration/calibration.cpp
@@ -676,8 +676,9 @@ istream& operator >>(istream &in, Calibration &c)
 {
     std::string line;
     while(getline(in, line)) {
+        QString qLine = QString::fromStdString(line).simplified();
         for(auto m : c.Measurements()) {
-            if(Calibration::MeasurementToString(m) == QString::fromStdString(line)) {
+            if(Calibration::MeasurementToString(m) == qLine) {
                 // this is the correct measurement
                 c.clearMeasurement(m);
                 uint timestamp;
@@ -699,8 +700,8 @@ istream& operator >>(istream &in, Calibration &c)
             }
         }
         for(auto t : Calibration::Types()) {
-            if(Calibration::TypeToString(t) == QString::fromStdString(line)) {
-                // try to P2 this calibration type
+            if(Calibration::TypeToString(t) == qLine) {
+                // try to apply this calibration type
                 if(c.calculationPossible(t)) {
                     c.constructErrorTerms(t);
                 } else {
diff --git a/Software/PC_Application/CustomWidgets/siunitedit.cpp b/Software/PC_Application/CustomWidgets/siunitedit.cpp
index ff3c3ca..62153b6 100644
--- a/Software/PC_Application/CustomWidgets/siunitedit.cpp
+++ b/Software/PC_Application/CustomWidgets/siunitedit.cpp
@@ -8,12 +8,13 @@
 SIUnitEdit::SIUnitEdit(QString unit, QString prefixes, int precision, QWidget *parent)
     : QLineEdit(parent)
 {
+    _value = 0;
     this->unit = unit;
     this->prefixes = prefixes;
     this->precision = precision;
     setAlignment(Qt::AlignCenter);
     installEventFilter(this);
-    setValidator(new QDoubleValidator);
+    setValidator(new QDoubleValidator(this));
     connect(this, &QLineEdit::editingFinished, [this]() {
        parseNewValue(1.0);
     });
diff --git a/Software/PC_Application/Device/device.cpp b/Software/PC_Application/Device/device.cpp
index 7961454..52c9286 100644
--- a/Software/PC_Application/Device/device.cpp
+++ b/Software/PC_Application/Device/device.cpp
@@ -40,7 +40,7 @@ USBInBuffer::~USBInBuffer()
             qWarning() << "Timed out waiting for mutex acquisition during disconnect";
         }
     }
-    delete buffer;
+    delete[] buffer;
 }
 
 void USBInBuffer::removeBytes(int handled_bytes)
@@ -71,16 +71,15 @@ void USBInBuffer::Callback(libusb_transfer *transfer)
         emit DataReceived();
         inCallback = false;
         break;
-    case LIBUSB_TRANSFER_ERROR:
-        qCritical() << "LIBUSB_TRANSFER_ERROR";
     case LIBUSB_TRANSFER_NO_DEVICE:
         qCritical() << "LIBUSB_TRANSFER_NO_DEVICE";
-    case LIBUSB_TRANSFER_OVERFLOW:
-        qCritical() << "LIBUSB_TRANSFER_OVERFLOW";
-    case LIBUSB_TRANSFER_STALL:
-        qCritical() << "LIBUSB_TRANSFER_STALL";
         libusb_free_transfer(transfer);
-        this->transfer = nullptr;
+        return;
+    case LIBUSB_TRANSFER_ERROR:
+    case LIBUSB_TRANSFER_OVERFLOW:
+    case LIBUSB_TRANSFER_STALL:
+        qCritical() << "LIBUSB_ERROR" << transfer->status;
+        libusb_free_transfer(transfer);
         emit TransferError();
         return;
         break;
@@ -129,6 +128,7 @@ Device::Device(QString serial)
     qDebug() << "Starting device connection...";
 
     m_handle = nullptr;
+    lastInfoValid = false;
     libusb_init(&m_context);
 
     SearchDevices([=](libusb_device_handle *handle, QString found_serial) -> bool {
@@ -202,6 +202,7 @@ Device::~Device()
         libusb_close(m_handle);
         m_receiveThread->join();
         libusb_exit(m_context);
+        delete m_receiveThread;
     }
 }
 
@@ -245,9 +246,7 @@ bool Device::SetManual(Protocol::ManualControl manual)
 
 bool Device::SetIdle()
 {
-    Protocol::SweepSettings s;
-    s.excitePort1 = 0;
-    s.excitePort2 = 0;
+    Protocol::SweepSettings s = {};
     return Configure(s);
 }
 
diff --git a/Software/PC_Application/Generator/generator.cpp b/Software/PC_Application/Generator/generator.cpp
index ae274ed..7a46bbf 100644
--- a/Software/PC_Application/Generator/generator.cpp
+++ b/Software/PC_Application/Generator/generator.cpp
@@ -4,7 +4,7 @@
 Generator::Generator(AppWindow *window)
     : Mode(window, "Signal Generator")
 {
-    central = new SignalgeneratorWidget();
+    central = new SignalgeneratorWidget(window);
 
     auto pref = Preferences::getInstance();
 
diff --git a/Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp b/Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp
index 3d676a5..43c4de3 100644
--- a/Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp
+++ b/Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp
@@ -43,9 +43,10 @@
 
 SpectrumAnalyzer::SpectrumAnalyzer(AppWindow *window)
     : Mode(window, "Spectrum Analyzer"),
-      central(new TileWidget(traceModel))
+      central(new TileWidget(traceModel, window))
 {
     averages = 1;
+    settings = {};
 
     // Create default traces
     auto tPort1 = new Trace("Port1", Qt::yellow);
@@ -120,7 +121,6 @@ SpectrumAnalyzer::SpectrumAnalyzer(AppWindow *window)
     auto tb_acq = new QToolBar("Acquisition");
 
     auto eBandwidth = new SIUnitEdit("Hz", " k", 3);
-    eBandwidth->setValueQuiet(settings.RBW);
     eBandwidth->setFixedWidth(70);
     eBandwidth->setToolTip("RBW");
     connect(eBandwidth, &SIUnitEdit::valueChanged, this, &SpectrumAnalyzer::SetRBW);
@@ -180,7 +180,7 @@ SpectrumAnalyzer::SpectrumAnalyzer(AppWindow *window)
     markerModel = new TraceMarkerModel(traceModel);
 
     auto tracesDock = new QDockWidget("Traces");
-    tracesDock->setWidget(new TraceWidget(traceModel, this, true));
+    tracesDock->setWidget(new TraceWidget(traceModel, window, true));
     window->addDockWidget(Qt::LeftDockWidgetArea, tracesDock);
     docks.insert(tracesDock);
 
diff --git a/Software/PC_Application/Traces/markerwidget.cpp b/Software/PC_Application/Traces/markerwidget.cpp
index 072d26f..5ae7d63 100644
--- a/Software/PC_Application/Traces/markerwidget.cpp
+++ b/Software/PC_Application/Traces/markerwidget.cpp
@@ -22,6 +22,9 @@ MarkerWidget::MarkerWidget(TraceMarkerModel &model, QWidget *parent) :
 
 MarkerWidget::~MarkerWidget()
 {
+    delete ui->tableView->itemDelegateForColumn(TraceMarkerModel::ColIndexTrace);
+    delete ui->tableView->itemDelegateForColumn(TraceMarkerModel::ColIndexType);
+    delete ui->tableView->itemDelegateForColumn(TraceMarkerModel::ColIndexSettings);
     delete ui;
 }
 
diff --git a/Software/PC_Application/Traces/tracemodel.cpp b/Software/PC_Application/Traces/tracemodel.cpp
index f30355f..387f931 100644
--- a/Software/PC_Application/Traces/tracemodel.cpp
+++ b/Software/PC_Application/Traces/tracemodel.cpp
@@ -9,6 +9,14 @@ TraceModel::TraceModel(QObject *parent)
     traces.clear();
 }
 
+TraceModel::~TraceModel()
+{
+    while(!traces.empty()) {
+        delete traces[0];
+        traces.erase(traces.begin());
+    }
+}
+
 void TraceModel::addTrace(Trace *t)
 {
     beginInsertRows(QModelIndex(), traces.size(), traces.size());
diff --git a/Software/PC_Application/Traces/tracemodel.h b/Software/PC_Application/Traces/tracemodel.h
index 874b238..26253ca 100644
--- a/Software/PC_Application/Traces/tracemodel.h
+++ b/Software/PC_Application/Traces/tracemodel.h
@@ -11,6 +11,7 @@ class TraceModel : public QAbstractTableModel
     Q_OBJECT
 public:
     TraceModel(QObject *parent = 0);
+    ~TraceModel();
 
     void addTrace(Trace *t);
     void removeTrace(unsigned int index);
diff --git a/Software/PC_Application/Traces/traceplot.cpp b/Software/PC_Application/Traces/traceplot.cpp
index 63dbfca..a0015de 100644
--- a/Software/PC_Application/Traces/traceplot.cpp
+++ b/Software/PC_Application/Traces/traceplot.cpp
@@ -75,7 +75,7 @@ void TracePlot::updateContextMenu()
     contextmenu->addSection("Traces");
     // Populate context menu
     for(auto t : traces) {
-        auto action = new QAction(t.first->name());
+        auto action = new QAction(t.first->name(), contextmenu);
         action->setCheckable(true);
         if(t.second) {
             action->setChecked(true);
@@ -86,7 +86,7 @@ void TracePlot::updateContextMenu()
         contextmenu->addAction(action);
     }
     contextmenu->addSeparator();
-    auto close = new QAction("Close");
+    auto close = new QAction("Close", contextmenu);
     contextmenu->addAction(close);
     connect(close, &QAction::triggered, [=]() {
         markedForDeletion = true;
diff --git a/Software/PC_Application/Traces/tracexyplot.cpp b/Software/PC_Application/Traces/tracexyplot.cpp
index ed26502..9a8122c 100644
--- a/Software/PC_Application/Traces/tracexyplot.cpp
+++ b/Software/PC_Application/Traces/tracexyplot.cpp
@@ -115,6 +115,25 @@ TraceXYPlot::TraceXYPlot(TraceModel &model, QWidget *parent)
     : TracePlot(parent),
       selectedMarker(nullptr)
 {
+    YAxis[0].log = false;
+    YAxis[0].Ytype = YAxisType::Disabled;
+    YAxis[0].rangeDiv = 1;
+    YAxis[0].rangeMax = 10;
+    YAxis[0].rangeMin = 0;
+    YAxis[0].autorange = false;
+    YAxis[1].log = false;
+    YAxis[1].Ytype = YAxisType::Disabled;
+    YAxis[1].rangeDiv = 1;
+    YAxis[1].rangeMax = 10;
+    YAxis[1].rangeMin = 0;
+    YAxis[1].autorange = false;
+    XAxis.Xtype = XAxisType::Frequency;
+    XAxis.log = false;
+    XAxis.rangeDiv = 1;
+    XAxis.rangeMax = 10;
+    XAxis.rangeMin = 0;
+    XAxis.autorange = true;
+
     plot = new QwtPlot(this);
 
     auto canvas = new QwtPlotCanvas(plot);
@@ -274,7 +293,7 @@ bool TraceXYPlot::isTDRtype(TraceXYPlot::YAxisType type)
 void TraceXYPlot::updateContextMenu()
 {
     contextmenu->clear();
-    auto setup = new QAction("Axis setup...");
+    auto setup = new QAction("Axis setup...", contextmenu);
     connect(setup, &QAction::triggered, [this]() {
         auto setup = new XYplotAxisDialog(this);
         setup->show();
@@ -295,7 +314,7 @@ void TraceXYPlot::updateContextMenu()
                 continue;
             }
 
-            auto action = new QAction(t.first->name());
+            auto action = new QAction(t.first->name(), contextmenu);
             action->setCheckable(true);
             if(tracesAxis[axis].find(t.first) != tracesAxis[axis].end()) {
                 action->setChecked(true);
@@ -307,7 +326,7 @@ void TraceXYPlot::updateContextMenu()
         }
     }
     contextmenu->addSeparator();
-    auto close = new QAction("Close");
+    auto close = new QAction("Close", contextmenu);
     contextmenu->addAction(close);
     connect(close, &QAction::triggered, [=]() {
         markedForDeletion = true;
diff --git a/Software/PC_Application/VNA/portextension.cpp b/Software/PC_Application/VNA/portextension.cpp
index 6558261..3bbc6be 100644
--- a/Software/PC_Application/VNA/portextension.cpp
+++ b/Software/PC_Application/VNA/portextension.cpp
@@ -2,6 +2,7 @@
 #include "ui_portextensioneditdialog.h"
 #include <QCheckBox>
 #include <cmath>
+#include <QDebug>
 
 using namespace std;
 
@@ -31,11 +32,92 @@ void PortExtension::applyToMeasurement(Protocol::Datapoint &d)
         if(measurements.size() > 0) {
             if(d.pointNum == 0) {
                 // sweep complete, evaluate measurement
-                // TODO
+
+                double last_phase = 0.0;
+                double phasediff_sum = 0.0;
+                vector<double> att_x, att_y;
+                double avg_x = 0.0, avg_y = 0.0;
+                for(auto m : measurements) {
+                    // grab correct measurement
+                    complex<double> reflection;
+                    if(isPort1) {
+                        reflection = complex<double>(m.real_S11, m.imag_S11);
+                    } else {
+                        reflection = complex<double>(m.real_S22, m.imag_S22);
+                    }
+                    // remove calkit if specified
+                    if(!isIdeal) {
+                        complex<double> calStandard;
+                        auto standards = kit->toSOLT(m.frequency);
+                        if(isOpen) {
+                            calStandard = standards.Open;
+                        } else {
+                            calStandard = standards.Short;
+                        }
+                        // remove effect of calibration standard
+                        reflection /= calStandard;
+                    }
+                    // sum phase differences to previous point
+                    auto phase = arg(reflection);
+                    if(m.pointNum == 0) {
+                        last_phase = phase;
+                    } else {
+                        auto phasediff = phase - last_phase;
+                        last_phase = phase;
+                        if(phasediff > M_PI) {
+                            phasediff -= 2 * M_PI;
+                        } else if(phasediff <= -M_PI) {
+                            phasediff += 2 * M_PI;
+                        }
+                        phasediff_sum += phasediff;
+                        qDebug() << phasediff;
+                    }
+
+                    double x = sqrt(m.frequency / measurements.back().frequency);
+                    double y = 20*log10(abs(reflection));
+                    att_x.push_back(x);
+                    att_y.push_back(y);
+                    avg_x += x;
+                    avg_y += y;
+                }
+                auto phase = phasediff_sum / (measurements.size() - 1);
+                auto freq_diff = measurements[1].frequency - measurements[0].frequency;
+                auto delay = -phase / (2 * M_PI * freq_diff);
+                // measured delay is two-way but port extension expects one-way
+                delay /= 2;
+
+                // calculate linear regression with transformed square root model
+                avg_x /= measurements.size();
+                avg_y /= measurements.size();
+                double sum_top = 0.0;
+                double sum_bottom = 0.0;
+                for(unsigned int i=0;i<att_x.size();i++) {
+                    sum_top += (att_x[i] - avg_x)*(att_y[i] - avg_y);
+                    sum_bottom += (att_x[i] - avg_x)*(att_x[i] - avg_x);
+                }
+                double beta = sum_top / sum_bottom;
+                double alpha = avg_y - beta * avg_x;
+
+                double DCloss = -alpha / 2;
+                double loss = -beta / 2;
+                double freq = measurements.back().frequency;
+                if(isPort1) {
+                    ui->P1Time->setValue(delay);
+                    ui->P1DCloss->setValue(DCloss);
+                    ui->P1Loss->setValue(loss);
+                    ui->P1Frequency->setValue(freq);
+                } else {
+                    ui->P2Time->setValue(delay);
+                    ui->P2DCloss->setValue(DCloss);
+                    ui->P2Loss->setValue(loss);
+                    ui->P2Frequency->setValue(freq);
+                }
+
                 if(msgBox) {
                     msgBox->close();
                     msgBox = nullptr;
                 }
+                measurements.clear();
             } else {
                 measurements.push_back(d);
             }
@@ -94,7 +176,7 @@ void PortExtension::edit()
     constexpr double c = 299792458;
 
     auto dialog = new QDialog();
-    auto ui = new Ui::PortExtensionEditDialog();
+    ui = new Ui::PortExtensionEditDialog();
     ui->setupUi(dialog);
 
     // set initial values
diff --git a/Software/PC_Application/VNA/portextension.h b/Software/PC_Application/VNA/portextension.h
index a7d145e..1045afd 100644
--- a/Software/PC_Application/VNA/portextension.h
+++ b/Software/PC_Application/VNA/portextension.h
@@ -7,6 +7,10 @@
 #include "Calibration/calkit.h"
 #include <QMessageBox>
 
+namespace Ui {
+class PortExtensionEditDialog;
+}
+
 class PortExtension : public QObject
 {
     Q_OBJECT
@@ -39,6 +43,7 @@ private:
     bool isIdeal;
     std::vector<Protocol::Datapoint> measurements;
     QMessageBox *msgBox;
+    Ui::PortExtensionEditDialog *ui;
 };
 
 #endif // PORTEXTENSION_H
diff --git a/Software/PC_Application/VNA/vna.cpp b/Software/PC_Application/VNA/vna.cpp
index d85d416..43de246 100644
--- a/Software/PC_Application/VNA/vna.cpp
+++ b/Software/PC_Application/VNA/vna.cpp
@@ -86,7 +86,7 @@ VNA::VNA(AppWindow *window)
     central->Child2()->Child2()->setPlot(tracesmith2);
 
     // Create menu entries and connections
-    auto calMenu = new QMenu("Calibration");
+    auto calMenu = new QMenu("Calibration", window);
     window->menuBar()->insertMenu(window->getUi()->menuWindow->menuAction(), calMenu);
     actions.insert(calMenu->menuAction());
     auto calDisable = calMenu->addAction("Disabled");
@@ -112,13 +112,13 @@ VNA::VNA(AppWindow *window)
     portExtension.setCalkit(&cal.getCalibrationKit());
 
     // Tools menu
-    auto toolsMenu = new QMenu("Tools");
+    auto toolsMenu = new QMenu("Tools", window);
     window->menuBar()->insertMenu(window->getUi()->menuWindow->menuAction(), toolsMenu);
     actions.insert(toolsMenu->menuAction());
     auto impedanceMatching = toolsMenu->addAction("Impedance Matching");
     connect(impedanceMatching, &QAction::triggered, this, &VNA::StartImpedanceMatching);
 
-    defaultCalMenu = new QMenu("Default Calibration");
+    defaultCalMenu = new QMenu("Default Calibration", window);
     assignDefaultCal = defaultCalMenu->addAction("Assign...");
     removeDefaultCal = defaultCalMenu->addAction("Remove");
     removeDefaultCal->setEnabled(false);
@@ -201,7 +201,6 @@ VNA::VNA(AppWindow *window)
     // Acquisition toolbar
     auto tb_acq = new QToolBar("Acquisition");
     auto dbm = new QDoubleSpinBox();
-    dbm->setValue(settings.cdbm_excitation * 100);
     dbm->setFixedWidth(95);
     dbm->setRange(-100.0, 100.0);
     dbm->setSingleStep(0.25);
@@ -215,7 +214,6 @@ VNA::VNA(AppWindow *window)
     auto points = new QSpinBox();
     points->setFixedWidth(55);
     points->setRange(1, 4501);
-    points->setValue(settings.points);
     points->setSingleStep(100);
     points->setToolTip("Points/sweep");
     connect(points, qOverload<int>(&QSpinBox::valueChanged), this, &VNA::SetPoints);
@@ -224,7 +222,6 @@ VNA::VNA(AppWindow *window)
     tb_acq->addWidget(points);
 
     auto eBandwidth = new SIUnitEdit("Hz", " k", 3);
-    eBandwidth->setValueQuiet(settings.if_bandwidth);
     eBandwidth->setFixedWidth(70);
     eBandwidth->setToolTip("IF bandwidth");
     connect(eBandwidth, &SIUnitEdit::valueChanged, this, &VNA::SetIFBandwidth);
@@ -255,7 +252,7 @@ VNA::VNA(AppWindow *window)
     calMenuGroup->addAction(calDisable);
     for(auto type : Calibration::Types()) {
         cbType->addItem(Calibration::TypeToString(type), (int) type);
-        auto menuAction = new QAction(Calibration::TypeToString(type));
+        auto menuAction = new QAction(Calibration::TypeToString(type), calMenu);
         calMenuGroup->addAction(menuAction);
         connect(menuAction, &QAction::triggered, [=](){
             ApplyCalibration(type);
@@ -316,7 +313,7 @@ VNA::VNA(AppWindow *window)
     toolbars.insert(tb_portExtension);
 
 
-    markerModel = new TraceMarkerModel(traceModel);
+    markerModel = new TraceMarkerModel(traceModel, this);
 
     auto tracesDock = new QDockWidget("Traces");
     tracesDock->setWidget(new TraceWidget(traceModel));
@@ -609,13 +606,13 @@ void VNA::ApplyCalibration(Calibration::Type type)
                 emit CalibrationApplied(type);
             }
         } catch (runtime_error e) {
-            QMessageBox::critical(this, "Calibration failure", e.what());
+            QMessageBox::critical(window, "Calibration failure", e.what());
             DisableCalibration(true);
         }
     } else {
         // Not all required traces available
         // TODO start tracedata dialog with required traces
-        QMessageBox::information(this, "Missing calibration traces", "Not all calibration traces for this type of calibration have been measured. The calibration can be enabled after the missing traces have been acquired.");
+        QMessageBox::information(window, "Missing calibration traces", "Not all calibration traces for this type of calibration have been measured. The calibration can be enabled after the missing traces have been acquired.");
         DisableCalibration(true);
         StartCalibrationDialog(type);
     }
@@ -679,11 +676,11 @@ void VNA::LoadSweepSettings()
     QSettings s;
     settings.f_start = s.value("SweepStart", pref.Startup.DefaultSweep.start).toULongLong();
     settings.f_stop = s.value("SweepStop", pref.Startup.DefaultSweep.stop).toULongLong();
-    ConstrainAndUpdateFrequencies();
-    SetIFBandwidth(s.value("SweepBandwidth", pref.Startup.DefaultSweep.bandwidth).toUInt());
     SetPoints(s.value("SweepPoints", pref.Startup.DefaultSweep.points).toInt());
+    SetIFBandwidth(s.value("SweepBandwidth", pref.Startup.DefaultSweep.bandwidth).toUInt());
     SetAveraging(s.value("SweepAveraging", pref.Startup.DefaultSweep.averaging).toInt());
     SetSourceLevel(s.value("SweepLevel", pref.Startup.DefaultSweep.excitation).toDouble());
+    ConstrainAndUpdateFrequencies();
 }
 
 void VNA::StoreSweepSettings()
diff --git a/Software/PC_Application/appwindow.cpp b/Software/PC_Application/appwindow.cpp
index 1549bcc..15f164b 100644
--- a/Software/PC_Application/appwindow.cpp
+++ b/Software/PC_Application/appwindow.cpp
@@ -59,8 +59,6 @@ AppWindow::AppWindow(QWidget *parent)
     device = nullptr;
 
     ui->setupUi(this);
-//    ui->statusbar->insertPermanentWidget(0, &lDeviceStatus);
-//    ui->statusbar->insertPermanentWidget(1, new QPushButton("Test"));
     ui->statusbar->addWidget(&lConnectionStatus);
     auto div1 = new QFrame;
     div1->setFrameShape(QFrame::VLine);
@@ -91,8 +89,6 @@ AppWindow::AppWindow(QWidget *parent)
     auto vna = new VNA(this);
     new Generator(this);
     new SpectrumAnalyzer(this);
-//    auto signalGenWidget = new Signalgenerator;
-//    modeSGen = new GUIMode(this, "Signal Generator", signalGenWidget);
 
     // UI connections
     connect(ui->actionUpdate_Device_List, &QAction::triggered, this, &AppWindow::UpdateDeviceList);
@@ -112,6 +108,11 @@ AppWindow::AppWindow(QWidget *parent)
         // settings might have changed, update necessary stuff
         TraceXYPlot::updateGraphColors();
     });
+    connect(ui->actionAbout, &QAction::triggered, [=](){
+        auto commit = QString(GITHASH);
+        commit.truncate(7);
+        QMessageBox::about(this, "About", "More information: github.com/jankae/VNA2\n\nVersion: " + commit);
+    });
 
     setWindowTitle("VNA");
 
@@ -137,6 +138,11 @@ AppWindow::AppWindow(QWidget *parent)
     }
 }
 
+AppWindow::~AppWindow()
+{
+    delete ui;
+}
+
 void AppWindow::closeEvent(QCloseEvent *event)
 {
     delete device;
diff --git a/Software/PC_Application/appwindow.h b/Software/PC_Application/appwindow.h
index 32dd158..e83c5ff 100644
--- a/Software/PC_Application/appwindow.h
+++ b/Software/PC_Application/appwindow.h
@@ -28,7 +28,7 @@ class AppWindow : public QMainWindow
     Q_OBJECT
 public:
     AppWindow(QWidget *parent = nullptr);
-
+    ~AppWindow();
 
     Ui::MainWindow *getUi() const;
     QStackedWidget *getCentral() const;
diff --git a/Software/PC_Application/main.ui b/Software/PC_Application/main.ui
index f06b85a..8217b38 100644
--- a/Software/PC_Application/main.ui
+++ b/Software/PC_Application/main.ui
@@ -69,9 +69,16 @@
     <addaction name="menuToolbars"/>
     <addaction name="actionPreferences"/>
    </widget>
+   <widget class="QMenu" name="menuHelp">
+    <property name="title">
+     <string>Help</string>
+    </property>
+    <addaction name="actionAbout"/>
+   </widget>
    <addaction name="menuFile"/>
    <addaction name="menuDevice"/>
    <addaction name="menuWindow"/>
+   <addaction name="menuHelp"/>
   </widget>
   <widget class="QStatusBar" name="statusbar"/>
   <action name="actionQuit">
@@ -139,6 +146,11 @@
     <string>Preferences</string>
    </property>
   </action>
+  <action name="actionAbout">
+   <property name="text">
+    <string>About</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="icons.qrc"/>
diff --git a/Software/PC_Application/mode.cpp b/Software/PC_Application/mode.cpp
index 977c981..8bfca2d 100644
--- a/Software/PC_Application/mode.cpp
+++ b/Software/PC_Application/mode.cpp
@@ -9,7 +9,8 @@ QWidget* Mode::cornerWidget = nullptr;
 QButtonGroup* Mode::modeButtonGroup = nullptr;
 
 Mode::Mode(AppWindow *window, QString name)
-    : window(window),
+    : QObject(window),
+      window(window),
       name(name),
       central(nullptr)
 {
diff --git a/Software/PC_Application/mode.h b/Software/PC_Application/mode.h
index d747c53..bde9739 100644
--- a/Software/PC_Application/mode.h
+++ b/Software/PC_Application/mode.h
@@ -9,10 +9,11 @@
 #include <set>
 #include "appwindow.h"
 
-class Mode : public QWidget
+class Mode : public QObject
 {
 public:
     Mode(AppWindow *window, QString name);
+
     virtual void activate();
     virtual void deactivate();
     QString getName() const;