diff --git a/src/ZB.MOM.WW.MxGateway.Worker.Tests/Probes/AlarmmgrObserveProbe.cs b/src/ZB.MOM.WW.MxGateway.Worker.Tests/Probes/AlarmmgrObserveProbe.cs
new file mode 100644
index 0000000..ca1b9b7
--- /dev/null
+++ b/src/ZB.MOM.WW.MxGateway.Worker.Tests/Probes/AlarmmgrObserveProbe.cs
@@ -0,0 +1,131 @@
+// AlarmmgrObserveProbe.cs
+//
+// Independent oracle for whether the dev-rig alarms actually toggle. Subscribes
+// via the native alarmmgr route (WnWrapAlarmConsumer / wwAlarmConsumerClass),
+// polls for ~35s, and logs every alarm transition it observes (Raise / Clear /
+// Ack). If TestMachine_001.TestAlarm001 is being flipped on a ~10s cadence this
+// will show alternating Raise/Clear; if nothing toggles it shows only the
+// initial active snapshot. Runs only with MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1.
+//
+// net48/x86: no init-only props, records, or index/range operators.
+
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Threading;
+using WNWRAPCONSUMERLib;
+using ZB.MOM.WW.MxGateway.Worker.MxAccess;
+using ZB.MOM.WW.MxGateway.Worker.Tests.TestSupport;
+using Xunit.Abstractions;
+
+namespace ZB.MOM.WW.MxGateway.Worker.Tests.Probes;
+
+/// <summary>
+///     Observation probe that reports alarm transitions seen through the native
+///     alarmmgr (wnwrap) consumer, to verify whether the rig's alarms toggle.
+/// </summary>
+public sealed class AlarmmgrObserveProbe
+{
+    private static readonly string SubscriptionExpression =
+        string.Format(@"\\{0}\Galaxy!DEV", Environment.MachineName);
+
+    private readonly ITestOutputHelper output;
+    private readonly ConcurrentQueue<string> log = new ConcurrentQueue<string>();
+    private readonly Stopwatch elapsed = Stopwatch.StartNew();
+
+    /// <summary>Initializes a new instance of the AlarmmgrObserveProbe class.</summary>
+    /// <param name="output">Test output helper for logging.</param>
+    public AlarmmgrObserveProbe(ITestOutputHelper output)
+    {
+        this.output = output;
+    }
+
+    /// <summary>
+    ///     Subscribes via the alarmmgr consumer and logs every transition seen
+    ///     over a ~35s window plus the final active-alarm snapshot.
+    /// </summary>
+    [LiveMxAccessFact]
+    public void Observe_AlarmTransitions_ViaAlarmmgr()
+    {
+        Exception? threadException = null;
+        ManualResetEventSlim done = new ManualResetEventSlim(false);
+        Thread thread = new Thread(() =>
+        {
+            try { Run(); }
+            catch (Exception ex) { threadException = ex; }
+            finally { done.Set(); }
+        });
+        thread.IsBackground = false;
+        thread.SetApartmentState(ApartmentState.STA);
+        thread.Start();
+        done.Wait();
+        thread.Join();
+
+        List<string> lines = new List<string>();
+        string? line;
+        while (log.TryDequeue(out line))
+        {
+            output.WriteLine(line);
+            lines.Add(line);
+        }
+
+        string logPath = Environment.GetEnvironmentVariable("PROBE_LOG")
+            ?? System.IO.Path.Combine(System.IO.Path.GetTempPath(), "alarmmgr-observe.log");
+        try { System.IO.File.WriteAllLines(logPath, lines); }
+        catch (Exception writeEx) { output.WriteLine("log write failed: " + writeEx.Message); }
+
+        if (threadException != null)
+        {
+            throw threadException;
+        }
+    }
+
+    private void Run()
+    {
+        Log("=== alarmmgr (wnwrap) observation ===");
+        Log("Subscription: " + SubscriptionExpression);
+
+        using WnWrapAlarmConsumer consumer = new WnWrapAlarmConsumer(
+            new wwAlarmConsumerClass(), maxAlarmsPerFetch: 1024);
+
+        int transitionCount = 0;
+        consumer.AlarmTransitionEmitted += (_, e) =>
+        {
+            Interlocked.Increment(ref transitionCount);
+            Log(string.Format(
+                "transition: Tag='{0}' State={1} Prev={2} Group='{3}' Provider='{4}'",
+                e.Record.TagName, e.Record.State, e.PreviousState,
+                e.Record.Group, e.Record.ProviderName));
+        };
+
+        consumer.Subscribe(SubscriptionExpression);
+        Log("Subscribed. Polling every 1s for 35s ...");
+
+        DateTime deadline = DateTime.UtcNow + TimeSpan.FromSeconds(35);
+        int polls = 0;
+        while (DateTime.UtcNow < deadline)
+        {
+            consumer.PollOnce();
+            polls++;
+            Thread.Sleep(1000);
+        }
+
+        Log(string.Format("Polling done. polls={0} transitions={1}", polls, transitionCount));
+
+        IReadOnlyList<MxAlarmSnapshotRecord> snapshot = consumer.SnapshotActiveAlarms();
+        Log(string.Format("Final active-alarm snapshot count={0}:", snapshot.Count));
+        foreach (MxAlarmSnapshotRecord r in snapshot)
+        {
+            Log(string.Format("  active: Tag='{0}' State={1} Group='{2}'",
+                r.TagName, r.State, r.Group));
+        }
+
+        Log("=== observation complete ===");
+    }
+
+    private void Log(string line)
+    {
+        log.Enqueue(string.Format("[t={0:F1}s] {1}", elapsed.Elapsed.TotalSeconds, line));
+    }
+}