diff --git a/prsctl/measurement_device/__init__.py b/photoreflectance/measurement_device/__init__.py
similarity index 100%
rename from prsctl/measurement_device/__init__.py
rename to photoreflectance/measurement_device/__init__.py
diff --git a/prsctl/measurement_device/base.py b/photoreflectance/measurement_device/base.py
similarity index 100%
rename from prsctl/measurement_device/base.py
rename to photoreflectance/measurement_device/base.py
diff --git a/prsctl/measurement_device/impl/sr830.py b/photoreflectance/measurement_device/impl/sr830.py
similarity index 100%
rename from prsctl/measurement_device/impl/sr830.py
rename to photoreflectance/measurement_device/impl/sr830.py
diff --git a/prsctl/measurement_device/impl/test.py b/photoreflectance/measurement_device/impl/test.py
similarity index 100%
rename from prsctl/measurement_device/impl/test.py
rename to photoreflectance/measurement_device/impl/test.py
diff --git a/prsctl/utility/__init__.py b/photoreflectance/utility/__init__.py
similarity index 100%
rename from prsctl/utility/__init__.py
rename to photoreflectance/utility/__init__.py
diff --git a/prsctl/utility/config_file.py b/photoreflectance/utility/config_file.py
similarity index 100%
rename from prsctl/utility/config_file.py
rename to photoreflectance/utility/config_file.py
diff --git a/prsctl/utility/data.py b/photoreflectance/utility/data.py
similarity index 100%
rename from prsctl/utility/data.py
rename to photoreflectance/utility/data.py
diff --git a/prsctl/utility/data_collector.py b/photoreflectance/utility/data_collector.py
similarity index 100%
rename from prsctl/utility/data_collector.py
rename to photoreflectance/utility/data_collector.py
diff --git a/prsctl/utility/device_select.py b/photoreflectance/utility/device_select.py
similarity index 100%
rename from prsctl/utility/device_select.py
rename to photoreflectance/utility/device_select.py
diff --git a/prsctl/utility/file_io.py b/photoreflectance/utility/file_io.py
similarity index 100%
rename from prsctl/utility/file_io.py
rename to photoreflectance/utility/file_io.py
diff --git a/photoreflectance/utility/testing.py b/photoreflectance/utility/testing.py
new file mode 100644
index 0000000..c4e9d79
--- /dev/null
+++ b/photoreflectance/utility/testing.py
@@ -0,0 +1,17 @@
+import numpy as np
+
+def testcurve(x, frequency=10, peak_width=2, amplitude=20, bias=0):
+    # 0 = pk - width
+    # 2pi = pk + width
+    # want peak at n*time == frequency
+    nearest_peak = np.round(x / frequency, 0)
+    # if not peak at 0 and within peak_width
+    if nearest_peak > 0 and np.abs((x - nearest_peak * frequency)) < peak_width:
+        # return sin that does one period within 2*peak_width
+        return amplitude * np.sin(2*np.pi * (x - nearest_peak * frequency - peak_width) / (2*peak_width)) + bias
+    else:
+        return bias
+
+def get_testcurve(frequency=10, peak_width=2, amplitude=20, bias=0):
+    return np.vectorize(lambda x: testcurve(x, frequency=frequency, peak_width=peak_width, amplitude=amplitude, bias=bias))
+
diff --git a/prsctl/utility/visa.py b/photoreflectance/utility/visa.py
similarity index 100%
rename from prsctl/utility/visa.py
rename to photoreflectance/utility/visa.py