diff --git a/src/aare/gui/models/user_sample_model.py b/src/aare/gui/models/user_sample_model.py
index 5e1bc4de..2890a43c 100644
--- a/src/aare/gui/models/user_sample_model.py
+++ b/src/aare/gui/models/user_sample_model.py
@@ -165,9 +165,9 @@ class UserSampleSpreadsheet(QAbstractTableModel):
 
     @staticmethod
     def _measured(sample: SampleShortInfo) -> bool:
-        # Automatic status, never relabelled by hand: a sample counts as
-        # measured once its rotation count exceeds 1.
-        return isinstance(sample.rotation_count, (int, float)) and sample.rotation_count > 1
+        # Automatic status, never relabelled by hand: any rotation data
+        # counts as measured (>= 1); unmeasured is exactly rotation count 0.
+        return isinstance(sample.rotation_count, (int, float)) and sample.rotation_count >= 1
 
     def set_queued_ids(self, db_ids) -> None:
         self.queued_ids = set(db_ids)
diff --git a/src/aare/gui/panels/tell_sample_panel.py b/src/aare/gui/panels/tell_sample_panel.py
index 59f8a3db..de664539 100644
--- a/src/aare/gui/panels/tell_sample_panel.py
+++ b/src/aare/gui/panels/tell_sample_panel.py
@@ -178,11 +178,11 @@ class TellSamplePanel(QFrame):
             else:
                 chip = QPushButton(label, self)
                 if key == "measured":
-                    chip.setToolTip("Filter measured samples (automatic: rotation count > 1)")
+                    chip.setToolTip("Filter measured samples (automatic: rotation count ≥ 1)")
                 elif key == "unmeasured":
                     chip.setToolTip(
-                        "Filter samples not yet measured — select all here to queue"
-                        " everything still to be done"
+                        "Filter samples with no rotation data yet — select all here to"
+                        " queue everything still to be done"
                     )
             chip.setCheckable(True)
             chip.setChecked(key is None)
diff --git a/tests/unit/gui/test_models.py b/tests/unit/gui/test_models.py
index 6459d835..4daa177a 100644
--- a/tests/unit/gui/test_models.py
+++ b/tests/unit/gui/test_models.py
@@ -143,7 +143,8 @@ def _row_of(model, db_id):
 def status_model(sample_list):
     from aarecommon.models.models import DewarAddress, SampleShortInfo
 
-    # A measured sample: rotation_count > 1 (exactly 1 must NOT count).
+    # A measured sample: any rotation data counts (exactly 1 MUST count;
+    # unmeasured is rotation_count 0, like the fixture's samples 1-3).
     sample_list.append(
         SampleShortInfo(
             db_id=4,
@@ -153,7 +154,7 @@ def status_model(sample_list):
             run_number=4,
             user="U1",
             pin=4,
-            rotation_count=2,
+            rotation_count=1,
             location=DewarAddress(segment="B", pos=1),
         )
     )
@@ -180,7 +181,7 @@ def test_status_color_priority(status_model):
     model.set_queued_ids(set())
     assert _status(model, _row_of(model, 1)) == SAMPLE_STATUS_FLAGGED_BG.lower()
 
-    # Measured is automatic: rotation_count 2 counts, the fixture's 1-3 don't.
+    # Measured is automatic: rotation_count 1 counts, the 0s of 1-3 don't.
     assert _status(model, _row_of(model, 4)) == SAMPLE_STATUS_MEASURED_BG.lower()
     assert _status(model, _row_of(model, 2)) is None