diff --git a/api/tests/opentrons/protocol_api/core/engine/test_absorbance_reader_core.py b/api/tests/opentrons/protocol_api/core/engine/test_absorbance_reader_core.py
index fd537d4cad93..6a602711ea28 100644
--- a/api/tests/opentrons/protocol_api/core/engine/test_absorbance_reader_core.py
+++ b/api/tests/opentrons/protocol_api/core/engine/test_absorbance_reader_core.py
@@ -69,59 +69,67 @@ def test_initialize(
 ) -> None:
     """It should set the sample wavelength with the engine client."""
     subject._ready_to_initialize = True
-    subject.initialize("single", [123])
+    subject.initialize("single", [350])
 
     decoy.verify(
         mock_engine_client.execute_command(
             cmd.absorbance_reader.InitializeParams(
                 moduleId="1234",
                 measureMode="single",
-                sampleWavelengths=[123],
+                sampleWavelengths=[350],
                 referenceWavelength=None,
             ),
         ),
         times=1,
     )
-    assert subject._initialized_value == [123]
+    assert subject._initialized_value == [350]
 
     # Test reference wavelength
-    subject.initialize("single", [124], 450)
+    subject.initialize("single", [350], 450)
 
     decoy.verify(
         mock_engine_client.execute_command(
             cmd.absorbance_reader.InitializeParams(
                 moduleId="1234",
                 measureMode="single",
-                sampleWavelengths=[124],
+                sampleWavelengths=[350],
                 referenceWavelength=450,
             ),
         ),
         times=1,
     )
-    assert subject._initialized_value == [124]
+    assert subject._initialized_value == [250]
 
     # Test initialize multi
-    subject.initialize("multi", [124, 125, 126])
+    subject.initialize("multi", [350, 400, 450])
 
     decoy.verify(
         mock_engine_client.execute_command(
             cmd.absorbance_reader.InitializeParams(
                 moduleId="1234",
                 measureMode="multi",
-                sampleWavelengths=[124, 125, 126],
+                sampleWavelengths=[350, 400, 450],
                 referenceWavelength=None,
             ),
         ),
         times=1,
     )
-    assert subject._initialized_value == [124, 125, 126]
+    assert subject._initialized_value == [350, 400, 450]
 
 
 def test_initialize_not_ready(subject: AbsorbanceReaderCore) -> None:
     """It should raise CannotPerformModuleAction if you dont call .close_lid() command."""
     subject._ready_to_initialize = False
     with pytest.raises(CannotPerformModuleAction):
-        subject.initialize("single", [123])
+        subject.initialize("single", [350])
+
+
+@pytest.mark.parametrize("wavelength", [-350, 0, 1200, "wda"])
+def test_invalid_wavelengths(wavelength: int, subject: AbsorbanceReaderCore) -> None:
+    """It should raise ValueError if you provide an invalid wavelength"""
+    subject._ready_to_initialize = True
+    with pytest.raises(ValueError):
+        subject.initialize("single", [wavelength])
 
 
 def test_read(
@@ -129,7 +137,7 @@ def test_read(
 ) -> None:
     """It should call absorbance reader to read with the engine client."""
     subject._ready_to_initialize = True
-    subject._initialized_value = [123]
+    subject._initialized_value = [350]
     substate = AbsorbanceReaderSubState(
         module_id=AbsorbanceReaderId(subject.module_id),
         configured=True,
@@ -152,6 +160,7 @@ def test_read(
         mock_engine_client.execute_command(
             cmd.absorbance_reader.ReadAbsorbanceParams(
                 moduleId="1234",
+                fileName=None,
             ),
         ),
         times=1,