diff --git a/Models/IoTesting/IoTestModels.cs b/Models/IoTesting/IoTestModels.cs
index 1c6e599fb..a1b70f1f8 100644
--- a/Models/IoTesting/IoTestModels.cs
+++ b/Models/IoTesting/IoTestModels.cs
@@ -189,7 +189,7 @@ private static string BuildEvidenceToolTip(IoTestTransitionEvidence? evidence, s
         var rawRelay = evidence.IedTimestamp?.ToString("O", CultureInfo.InvariantCulture) ?? "not supplied";
         var captured = evidence.CapturedAt.ToString("O", CultureInfo.InvariantCulture);
         return $"Displayed (rounded to nearest ms): {displayed}\n" +
-               $"Raw IED timestamp (full precision): {rawRelay}\n" +
+               $"Decoded IED timestamp (full precision): {rawRelay}\n" +
                $"ARSAS capture (full precision): {captured}\n" +
                $"Quality: {evidence.Quality}\nSource: {evidence.AcquisitionSource}\n" +
                $"{evidence.Verdict}: {evidence.VerdictReason}";
diff --git a/tests/ARSAS.Tests/IoFatTimestampTooltipTests.cs b/tests/ARSAS.Tests/IoFatTimestampTooltipTests.cs
index 87ee74f23..4811af14d 100644
--- a/tests/ARSAS.Tests/IoFatTimestampTooltipTests.cs
+++ b/tests/ARSAS.Tests/IoFatTimestampTooltipTests.cs
@@ -7,7 +7,7 @@ namespace ARSAS.Tests;
 public sealed class IoFatTimestampTooltipTests
 {
     [Fact]
-    public void TimestampHover_ShowsRoundedDisplayAndRawFullPrecision()
+    public void TimestampHover_ShowsRoundedDisplayAndDecodedFullPrecision()
     {
         var timestamp = new DateTimeOffset(2026, 8, 13, 12, 0, 31, TimeSpan.FromHours(7))
             .AddTicks(2_006_000);
@@ -34,9 +34,10 @@ public void TimestampHover_ShowsRoundedDisplayAndRawFullPrecision()
 
         Assert.Contains("Displayed (rounded to nearest ms): 2026-08-13 12:00:31.201 +07:00", tooltip, StringComparison.Ordinal);
         Assert.Contains(
-            "Raw IED timestamp (full precision): " + timestamp.ToString("O", CultureInfo.InvariantCulture),
+            "Decoded IED timestamp (full precision): " + timestamp.ToString("O", CultureInfo.InvariantCulture),
             tooltip,
             StringComparison.Ordinal);
+        Assert.DoesNotContain("Raw IED timestamp", tooltip, StringComparison.Ordinal);
         Assert.Contains("ARSAS capture (full precision):", tooltip, StringComparison.Ordinal);
         Assert.Contains("Quality: Good", tooltip, StringComparison.Ordinal);
         Assert.Contains("Source: BRCB", tooltip, StringComparison.Ordinal);