diff --git a/src/client/DCSInsight/DCSInsight.csproj b/src/client/DCSInsight/DCSInsight.csproj
index 34c35d9..129e9f0 100644
--- a/src/client/DCSInsight/DCSInsight.csproj
+++ b/src/client/DCSInsight/DCSInsight.csproj
@@ -6,7 +6,7 @@
     <UseWPF>true</UseWPF>
     <AssemblyName>dcs-insight</AssemblyName>
     <Version>1.0.0</Version>
-    <AssemblyVersion>1.6.0</AssemblyVersion>
+    <AssemblyVersion>1.7.0</AssemblyVersion>
     <ApplicationIcon>Images\Magnifier_icon.ico</ApplicationIcon>
   </PropertyGroup>
   <ItemGroup>
diff --git a/src/client/DCSInsight/UserControls/UserControlAPI.xaml.cs b/src/client/DCSInsight/UserControls/UserControlAPI.xaml.cs
index 9978276..d130574 100644
--- a/src/client/DCSInsight/UserControls/UserControlAPI.xaml.cs
+++ b/src/client/DCSInsight/UserControls/UserControlAPI.xaml.cs
@@ -293,11 +293,11 @@ private void ButtonSend_OnClick(object sender, RoutedEventArgs e)
             }
         }
 
-        private void StopPolling()
+        private void StartPolling(int milliseconds)
         {
             try
             {
-                _pollingTimer.Change(Timeout.Infinite, Timeout.Infinite);
+                _pollingTimer.Change(milliseconds, milliseconds);
                 SetFormState();
             }
             catch (Exception ex)
@@ -306,31 +306,31 @@ private void StopPolling()
             }
         }
 
-        private void PollingTimerCallback(object state)
+        private void StopPolling()
         {
             try
             {
-                if (_canSend)
-                {
-                    Dispatcher?.BeginInvoke((Action)(SendCommand));
-                }
+                _pollingTimer.Change(Timeout.Infinite, Timeout.Infinite);
+                SetFormState();
             }
             catch (Exception ex)
             {
-                ICEventHandler.SendErrorMessage( "Timer Polling Error", ex);
+                Common.ShowErrorMessageBox(ex);
             }
         }
 
-        private void StartPolling(int milliseconds)
+        private void PollingTimerCallback(object state)
         {
             try
             {
-                _pollingTimer.Change(milliseconds, milliseconds);
-                SetFormState();
+                if (_canSend)
+                {
+                    Dispatcher?.BeginInvoke((Action)(SendCommand));
+                }
             }
             catch (Exception ex)
             {
-                Common.ShowErrorMessageBox(ex);
+                ICEventHandler.SendErrorMessage( "Timer Polling Error", ex);
             }
         }
 
diff --git a/src/client/DCSInsight/Windows/WindowRangeTest.xaml b/src/client/DCSInsight/Windows/WindowRangeTest.xaml
index aadf858..69a7104 100644
--- a/src/client/DCSInsight/Windows/WindowRangeTest.xaml
+++ b/src/client/DCSInsight/Windows/WindowRangeTest.xaml
@@ -21,6 +21,7 @@
             <ComboBox Width="auto" MinWidth="200" Name="ComboBoxAPI" FontFamily="Consolas" SelectionChanged="ComboBoxAPI_OnSelectionChanged" ></ComboBox>
             <Button  Content="Start" Width="50" Margin="10,0,0,0" BorderBrush="Gray" FontSize="14" Name="ButtonStart"  Click="ButtonStart_OnClick"></Button>
             <Button  Content="Stop" Width="50" Margin="10,0,0,0" BorderBrush="Gray" FontSize="14" Name="ButtonStop"  Click="ButtonStop_OnClick"></Button>
+            <Label Name="LabelLoopPulse" VerticalAlignment="Center" Content=" " FontSize="16" Height="22"  Margin="10,0,0,0" />
             <Label VerticalAlignment="Center" Content="Loop"  Margin="10,0,0,0" />
             <Label VerticalAlignment="Center" Margin="0,0,0,0" >
                 <CheckBox Name="CheckBoxLoop" VerticalAlignment="Center" IsChecked="False" Checked="CheckBoxLoop_OnChecked" Unchecked="CheckBoxLoop_OnUnchecked"/>
diff --git a/src/client/DCSInsight/Windows/WindowRangeTest.xaml.cs b/src/client/DCSInsight/Windows/WindowRangeTest.xaml.cs
index 0a89b98..533dca7 100644
--- a/src/client/DCSInsight/Windows/WindowRangeTest.xaml.cs
+++ b/src/client/DCSInsight/Windows/WindowRangeTest.xaml.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.ComponentModel.Design;
 using System.Diagnostics;
 using System.Linq;
 using System.Text;
@@ -37,6 +38,8 @@ public partial class WindowRangeTest : Window, IErrorListener, IConnectionListen
         private readonly int _threadLoopSleep = 50;
         private readonly List<ResultComparator> _resultComparatorList = new();
         private readonly object _lockObject = new();
+        private Timer _timerLoopPulse;
+        private readonly int _pulseVisibilityTime = 500;
 
         public WindowRangeTest(List<DCSAPI> dcsAPIList)
         {
@@ -62,6 +65,9 @@ private void WindowRangeTest_OnLoaded(object sender, RoutedEventArgs e)
             {
                 if (_formLoaded) return;
 
+                _timerLoopPulse = new Timer(PulseTimerCallback);
+                _timerLoopPulse.Change(Timeout.Infinite, Timeout.Infinite);
+                
                 CheckBoxTop.IsChecked = true;
                 PopulateAPIComboBox();
                 SetFormState();
@@ -82,6 +88,7 @@ private void SetFormState()
                 ButtonStop.IsEnabled = _isRunning && !_stopRunning;
                 CheckBoxLoop.IsEnabled = _isConnected;
                 CheckBoxShowChangesOnly.IsEnabled = CheckBoxLoop.IsChecked == true;
+                LabelLoopPulse.Visibility = _isConnected && CheckBoxLoop.IsEnabled && _isRunning ? Visibility.Visible : Visibility.Collapsed;
             }
             catch (Exception ex)
             {
@@ -218,11 +225,12 @@ private void Loop1(int i, int x)
                 {
                     do
                     {
+                        StartPulse(_pulseVisibilityTime);
                         Dispatcher?.BeginInvoke((Action)(() => Mouse.OverrideCursor = Cursors.Wait));
                         for (var b = i; b <= x; b++)
                         {
                             if (_stopRunning) return;
-
+                            
                             _dcsAPI.Parameters[0].Value = b.ToString();
 
                             SetCurrentTestStructure(_dcsAPI);
@@ -258,12 +266,14 @@ private void Loop2(int i, int x, int j, int y)
 
                     do
                     {
+                        StartPulse(_pulseVisibilityTime);
+
                         for (var b = i; b <= x; b++)
                         {
                             for (var c = j; c <= y; c++)
                             {
                                 if (_stopRunning) return;
-
+                                
                                 _dcsAPI.Parameters[0].Value = b.ToString();
                                 _dcsAPI.Parameters[1].Value = c.ToString();
                                 if(_resultComparatorList.Count > 0) _resultComparatorList[0].GetResultString();
@@ -301,6 +311,8 @@ private void Loop3(int i, int x, int j, int y, int k, int z)
                     Dispatcher?.BeginInvoke((Action)(() => Mouse.OverrideCursor = Cursors.Wait));
                     do
                     {
+                        StartPulse(_pulseVisibilityTime);
+
                         for (var b = i; b <= x; b++)
                         {
                             for (var c = j; c <= y; c++)
@@ -308,7 +320,7 @@ private void Loop3(int i, int x, int j, int y, int k, int z)
                                 for (var d = k; d <= z; d++)
                                 {
                                     if (_stopRunning) return;
-
+                                    
                                     _dcsAPI.Parameters[0].Value = b.ToString();
                                     _dcsAPI.Parameters[1].Value = c.ToString();
                                     _dcsAPI.Parameters[2].Value = d.ToString();
@@ -525,6 +537,36 @@ private void CheckBoxTop_OnUnchecked(object sender, RoutedEventArgs e)
             }
         }
 
+        private void StartPulse(int milliseconds)
+        {
+            try
+            {
+                Dispatcher?.BeginInvoke((Action)(() => LabelLoopPulse.Content = "*"));
+                
+                _timerLoopPulse.Change(milliseconds, milliseconds);
+                Dispatcher?.BeginInvoke((Action)( SetFormState)); 
+            }
+            catch (Exception ex)
+            {
+                Common.ShowErrorMessageBox(ex);
+            }
+        }
+
+        private void PulseTimerCallback(object state)
+        {
+            try
+            {
+                Dispatcher?.BeginInvoke((Action)(() => LabelLoopPulse.Content = " "));
+                Dispatcher?.BeginInvoke((Action)(() => ToolBarMain.UpdateLayout()));
+                _timerLoopPulse.Change(Timeout.Infinite, Timeout.Infinite);
+                Dispatcher?.BeginInvoke((Action)(SetFormState)); 
+            }
+            catch (Exception ex)
+            {
+                ICEventHandler.SendErrorMessage("Timer Polling Error", ex);
+            }
+        }
+
         private void TextBoxParameter_OnKeyDown_Number(object sender, KeyEventArgs e)
         {
             try