diff --git a/ClassDigitizer2Gen.h b/ClassDigitizer2Gen.h
index e690b46..0831989 100644
--- a/ClassDigitizer2Gen.h
+++ b/ClassDigitizer2Gen.h
@@ -64,10 +64,10 @@ class Digitizer2Gen {
     Digitizer2Gen();
     ~Digitizer2Gen();
 
-    unsigned short GetSerialNumber() {return serialNumber;}
+    unsigned short GetSerialNumber() const{return serialNumber;}
 
     void  SetDummy(unsigned short sn);
-    bool  IsDummy() {return isDummy;}
+    bool  IsDummy() const {return isDummy;}
 
     int OpenDigitizer(const char * url);
     bool IsConnected() const {return isConnected;}
@@ -100,8 +100,10 @@ class Digitizer2Gen {
                                                 // 3 = only ch, energy, timestamp, minimum
                                                 // 15 = raw data
     int  ReadData();
-    int  ReadStat();
+    int  ReadStat(); // digitizer update it every 500 msec
     void PrintStat();
+    uint32_t GetTriggerCount(int ch) const {return triggerCount[ch];}
+    uint64_t GetRealTime(int ch) const {return realTime[ch];}
 
     void Reset();
     void ProgramPHA(bool testPulse = false);
diff --git a/mainwindow.cpp b/mainwindow.cpp
index f859f4a..f88d80d 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -43,6 +43,10 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent){
     scalarLayout->setSpacing(0);
 
     leTrigger = NULL;
+    leAccept = NULL;
+
+    scalarThread = new ScalarThread();
+    connect(scalarThread, &ScalarThread::updataScalar, this, &MainWindow::UpdateScalar);
   }
 
   QWidget * mainLayoutWidget = new QWidget(this);
@@ -203,6 +207,7 @@ MainWindow::~MainWindow(){
   printf("- %s\n", __func__);
 
   DeleteTriggerLineEdit();
+  delete scalarThread;
   CloseDigitizers();
   
   //---- need manually delete
@@ -233,6 +238,9 @@ void MainWindow::StartACQ(){
     readDataThread[i]->start();
   }
 
+  if( !scalar->isVisible() ) scalar->show();
+  scalarThread->start();
+
   bnStartACQ->setEnabled(false);
   bnStopACQ->setEnabled(true);
   bnOpenScope->setEnabled(false);
@@ -252,6 +260,10 @@ void MainWindow::StopACQ(){
 
   }
 
+  scalarThread->Stop();
+  scalarThread->quit();
+  scalarThread->wait();
+
   LogMsg("Stop Run");
   bnStartACQ->setEnabled(true);
   bnStopACQ->setEnabled(false);
@@ -260,6 +272,9 @@ void MainWindow::StopACQ(){
   runID ++;
   leRunID->setText(QString::number(runID));
 
+  //if( scalarThread->isRunning()) printf("Scalar Thread still running.\n");
+  //if( scalarThread->isFinished()) printf("Scalar Thread finsihed.\n");
+
 }
 
 //^###################################################################### open and close digitizer
@@ -380,7 +395,7 @@ void MainWindow::OpenScaler(){
 
 void MainWindow::SetUpScalar(){
 
-  scalar->setGeometry(0, 0, 10 + nDigi * 100, 1000);
+  scalar->setGeometry(0, 0, 10 + nDigi * 200, 1000);
 
   int rowID = 0;
   for( int ch = 0; ch < MaxNumberOfChannel; ch++){
@@ -396,22 +411,30 @@ void MainWindow::SetUpScalar(){
   }
   
   leTrigger = new QLineEdit**[nDigi];
+  leAccept = new QLineEdit**[nDigi];
   for( int iDigi = 0; iDigi < nDigi; iDigi++){
     rowID = 0;
     leTrigger[iDigi] = new QLineEdit *[digi[iDigi]->GetNChannels()];
+    leAccept[iDigi] = new QLineEdit *[digi[iDigi]->GetNChannels()];
     for( int ch = 0; ch < MaxNumberOfChannel; ch++){
 
       if( ch == 0 ){
           QLabel * lbDigi = new QLabel("Digi-" + QString::number(digi[iDigi]->GetSerialNumber()), scalar); 
           lbDigi->setAlignment(Qt::AlignCenter);
-          scalarLayout->addWidget(lbDigi, rowID, iDigi+1);
+          scalarLayout->addWidget(lbDigi, rowID, 2*iDigi+1, 1, 2);
       }
     
       rowID ++;
       
       leTrigger[iDigi][ch] = new QLineEdit();
       leTrigger[iDigi][ch]->setReadOnly(true);
-      scalarLayout->addWidget(leTrigger[iDigi][ch], rowID, iDigi+1);
+      leTrigger[iDigi][ch]->setAlignment(Qt::AlignRight);
+      scalarLayout->addWidget(leTrigger[iDigi][ch], rowID, 2*iDigi+1);
+
+      leAccept[iDigi][ch] = new QLineEdit();
+      leAccept[iDigi][ch]->setReadOnly(true);
+      leAccept[iDigi][ch]->setAlignment(Qt::AlignRight);
+      scalarLayout->addWidget(leAccept[iDigi][ch], rowID, 2*iDigi+2);
     }
   }
 
@@ -419,19 +442,55 @@ void MainWindow::SetUpScalar(){
 
 void MainWindow::DeleteTriggerLineEdit(){
 
-  printf("__________ %s \n", __func__);
-
   if( leTrigger == NULL ) return;
 
   for( int i = 0; i < nDigi; i++){
     for( int ch = 0; ch < digi[i]->GetNChannels(); ch ++){
       delete leTrigger[i][ch];
+      delete leAccept[i][ch];
     }
     delete [] leTrigger[i];
+    delete [] leAccept[i];
   }
   delete [] leTrigger;
   leTrigger = NULL;
-  printf("end of ____ %s \n", __func__);
+  leAccept = NULL;
+
+}
+
+void MainWindow::UpdateScalar(){
+  if( !digi ) return;
+
+  ///===== Get trigger for all channel
+  for( int iDigi = 0; iDigi < nDigi; iDigi ++ ){
+    if( digi[iDigi]->IsDummy() ) return;
+    
+    //=========== use ReadStat to get the trigger rate
+    //digiMTX.lock();
+    //digi[iDigi]->ReadStat(); // digitizer update it every 500 msec;
+    //digiMTX.unlock();
+    //for( int ch = 0; ch < digi[iDigi]->GetNChannels(); ch ++){
+    //  leTrigger[iDigi][ch]->setText(QString::number(digi[iDigi]->GetTriggerCount(ch)*1e9*1.0/ digi[iDigi]->GetRealTime(ch)));
+    //}
+
+    //=========== another method, directly readValue
+    digiMTX.lock();
+    for( int ch = 0; ch < digi[iDigi]->GetNChannels(); ch ++){
+      std::string time = digi[iDigi]->ReadChValue(std::to_string(ch), DIGIPARA::CH::ChannelRealtime); // for refreashing SelfTrgRate and SavedCount
+      std::string haha = digi[iDigi]->ReadChValue(std::to_string(ch), DIGIPARA::CH::SelfTrgRate);
+      leTrigger[iDigi][ch]->setText(QString::fromStdString(haha));
+      std::string kaka = digi[iDigi]->ReadChValue(std::to_string(ch), DIGIPARA::CH::ChannelSavedCount);
+      double acceptRate = atoi(kaka.c_str())*1e9*1.0 / atol(time.c_str());
+      //if( kaka != "0" )  {
+      //  printf("%s, %s | %.2f\n", time.c_str(), kaka.c_str(), acceptRate);
+      //}
+      leAccept[iDigi][ch]->setText(QString::number(acceptRate,'f', 1));
+
+      ///TODO============== push the trigger, acceptRate rate database
+
+    }
+    digiMTX.unlock();
+  }
 
 }
 
diff --git a/mainwindow.h b/mainwindow.h
index a481f6f..a41da53 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -45,6 +45,7 @@ private slots:
   void OpenScaler();
   void SetUpScalar();
   void DeleteTriggerLineEdit();
+  void UpdateScalar();
 
   void ProgramSettings();
   bool OpenProgramSettings();
@@ -59,10 +60,7 @@ private slots:
   void CreateRawDataFolderAndLink(const QString newExpName);
 
   void closeEvent(QCloseEvent * event){
-    printf("___ %s \n", __func__);
-    printf("+++++++++++++++  digiSetting %p\n", digiSetting);
     if( digiSetting != NULL ) digiSetting->close();
-    printf("+++++++++++++++  scope %p\n", scope);
     if( scope != NULL ) scope->close();
     event->accept();
   }
@@ -90,7 +88,9 @@ private:
   QMainWindow * scalar;
   QPushButton * bnOpenScalar;
   QLineEdit *** leTrigger; // need to delete manually
+  QLineEdit *** leAccept; // need to delete manually
   QGridLayout * scalarLayout;
+  ScalarThread * scalarThread;
 
   //@------ ACQ things
   QPushButton * bnStartACQ;
diff --git a/manyThread.h b/manyThread.h
index 162398f..31ada72 100644
--- a/manyThread.h
+++ b/manyThread.h
@@ -31,7 +31,7 @@ public:
         digi->ErrorMsg("No more data");
         break;
       }else{
-        digi->ErrorMsg("ReadDataLoop()");
+        //digi->ErrorMsg("ReadDataLoop()");
         digi->evt->ClearTrace();
       }
 
@@ -83,4 +83,32 @@ private:
   unsigned int waitTime; //100 of milisec
 };
 
+//^#======================================================= Scalar Thread
+class ScalarThread : public QThread {
+  Q_OBJECT
+public:
+  ScalarThread(QObject * parent = 0 ) : QThread(parent){
+    waitTime = 20; // 10 x 100 milisec
+    stop = false;
+  }
+  void Stop() { this->stop = true;}
+  unsigned int GetWaitTimeinSec() const {return waitTime/10;}
+  void run(){
+    unsigned int count  = 0;
+    stop = false;
+    do{
+      usleep(100000);
+      count ++;
+      if( count % waitTime == 0){
+        emit updataScalar();
+      }
+    }while(!stop);
+  }
+signals:
+  void updataScalar();
+private:
+  bool stop;
+  unsigned int waitTime;
+};
+
 #endif
diff --git a/scope.cpp b/scope.cpp
index a9f3850..6707708 100644
--- a/scope.cpp
+++ b/scope.cpp
@@ -334,6 +334,15 @@ Scope::Scope(Digitizer2Gen **digi, unsigned int nDigi, ReadDataThread ** readDat
   layout->addWidget(bnScopeStop, rowID, 1);
   connect(bnScopeStop, &QPushButton::clicked, this, &Scope::StopScope);
 
+  QLabel * lbTriggerRate = new QLabel("Trigger Rate [Hz] : ", this);
+  lbTriggerRate->setAlignment(Qt::AlignCenter | Qt::AlignRight);
+  layout->addWidget(lbTriggerRate, rowID, 2);
+
+  leTriggerRate = new QLineEdit(this);
+  leTriggerRate->setAlignment(Qt::AlignRight);
+  leTriggerRate->setReadOnly(true);
+  layout->addWidget(leTriggerRate, rowID, 3);
+
   QPushButton * bnClose = new QPushButton("Close", this);
   layout->addWidget(bnClose, rowID, 5);
   connect(bnClose, &QPushButton::clicked, this, &Scope::close);
@@ -458,16 +467,25 @@ void Scope::StopScope(){
 void Scope::UpdateScope(){
 
   int iDigi = cbScopeDigi->currentIndex();
+  int ch = cbScopeCh->currentIndex();
   int sample2ns = DIGIPARA::TraceStep * (1 << cbWaveRes->currentIndex());
 
   if( digi ){
-    digiMTX.lock();
-    unsigned int traceLength = digi[iDigi]->evt->traceLenght;
-    unsigned int dataLength = dataTrace[0]->count();
-
     //---- remove all points
+    unsigned int dataLength = dataTrace[0]->count();
     for( int j = 0; j < 6; j++ ) dataTrace[j]->removePoints(0, dataLength);
 
+    digiMTX.lock();    
+    std::string time = digi[iDigi]->ReadChValue(std::to_string(ch), DIGIPARA::CH::ChannelRealtime); // for refreashing SelfTrgRate and SavedCount
+    std::string haha = digi[iDigi]->ReadChValue(std::to_string(ch), DIGIPARA::CH::SelfTrgRate);
+    leTriggerRate->setText(QString::fromStdString(haha));
+    if( atoi(haha.c_str()) == 0 ) {
+      digiMTX.unlock();
+      return;
+    }
+    
+    unsigned int traceLength = digi[iDigi]->evt->traceLenght;
+
     for( unsigned int i = 0 ; i < traceLength; i++){ 
       for( int j = 0; j < 2; j++) dataTrace[j]->append(sample2ns * i, digi[iDigi]->evt->analog_probes[j][i]);
       for( int j = 2; j < 6; j++) dataTrace[j]->append(sample2ns * i, (j-1)*1000 + 4000 * digi[iDigi]->evt->digital_probes[j-2][i]);
diff --git a/scope.h b/scope.h
index ddca303..009e7d6 100644
--- a/scope.h
+++ b/scope.h
@@ -8,6 +8,7 @@
 #include <QSpinBox>
 #include <QPushButton>
 #include <QCheckBox>
+#include <QLineEdit>
 #include <QComboBox>
 #include <QGridLayout>
 #include <QLineSeries>
@@ -164,6 +165,8 @@ private:
   QComboBox * cbWaveRes;
   QComboBox * cbTrapPeakAvg;
 
+  QLineEdit * leTriggerRate;
+
   QSpinBox * sbBaselineGuard;
   QSpinBox * sbPileUpGuard;
   QComboBox * cbBaselineAvg;