diff --git a/RbFreqStandMeasure/tools/UnitConvertHelper.cs b/RbFreqStandMeasure/tools/UnitConvertHelper.cs
index 77c3d4e..fe7e5c8 100644
--- a/RbFreqStandMeasure/tools/UnitConvertHelper.cs
+++ b/RbFreqStandMeasure/tools/UnitConvertHelper.cs
@@ -80,7 +80,7 @@
             switch (unit)
             {
                 case "uHz":
-                    return _freValue * 1000 * 1000 + "μHz";
+                    return _freValue * 1000 * 1000 + "uHz";
                 case "mHz":
                     return _freValue * 1000 + "mHz";
                 case "Hz":
@@ -106,7 +106,7 @@
                 case "ns":
                     return _periodValue * 1000 * 1000 * 1000 + "ns";
                 case "us":
-                    return _periodValue * 1000 * 1000 + "μs";
+                    return _periodValue * 1000 * 1000 + "us";
                 case "ms":
                     return _periodValue * 1000 + "ms";
                 case "s":