diff --git a/lib/FT18_STW_DISPLAY/FT18_STW_DISPLAY.h b/lib/FT18_STW_DISPLAY/FT18_STW_DISPLAY.h
index 9eacb5b..b7188fc 100644
--- a/lib/FT18_STW_DISPLAY/FT18_STW_DISPLAY.h
+++ b/lib/FT18_STW_DISPLAY/FT18_STW_DISPLAY.h
@@ -94,7 +94,7 @@ protected:
 #define TT_COL1 EA_GREEN
 #define TT_COL2 EA_ORANGE
 #define TT_COL3 EA_RED
-#define TT_THRESH1 50
+#define TT_THRESH1 40
 #define TT_THRESH2 60
 #define TT_THRESH3 70