diff --git a/src/EyesAndEars.UWP/EyesAndEars.UWP/Services/DataServices.cs b/src/EyesAndEars.UWP/EyesAndEars.UWP/Services/DataServices.cs
index 619f2ba..dc17834 100644
--- a/src/EyesAndEars.UWP/EyesAndEars.UWP/Services/DataServices.cs
+++ b/src/EyesAndEars.UWP/EyesAndEars.UWP/Services/DataServices.cs
@@ -97,7 +97,7 @@ namespace EyesAndEars.UWP.Services {
                      */
 
                     if (device == 1) {
-                        if (reading > 0 && reading <= 38) // No weld detected.
+                        if (reading > 0 && reading <= 39) // No weld detected.
                             return new SolidColorBrush(Colors.LightSeaGreen);
                         if (reading > 38) // Weld detected.
                             return new SolidColorBrush(Colors.DarkSeaGreen);