diff --git a/app/models/measurement.rb b/app/models/measurement.rb
new file mode 100644
index 0000000..2c39ebe
--- /dev/null
+++ b/app/models/measurement.rb
@@ -0,0 +1,2 @@
+class Measurement < ActiveRecord::Base
+end
diff --git a/app/models/readout.rb b/app/models/readout.rb
new file mode 100644
index 0000000..9f93031
--- /dev/null
+++ b/app/models/readout.rb
@@ -0,0 +1,2 @@
+class Readout < ActiveRecord::Base
+end
diff --git a/app/models/readout_value.rb b/app/models/readout_value.rb
new file mode 100644
index 0000000..6fb55d6
--- /dev/null
+++ b/app/models/readout_value.rb
@@ -0,0 +1,2 @@
+class ReadoutValue < ActiveRecord::Base
+end
diff --git a/db/migrate/003_create_measurements.rb b/db/migrate/003_create_measurements.rb
new file mode 100644
index 0000000..b22391a
--- /dev/null
+++ b/db/migrate/003_create_measurements.rb
@@ -0,0 +1,10 @@
+class CreateMeasurements < ActiveRecord::Migration
+  def change
+    create_table :measurements do |t|
+      t.string :name
+      t.boolean :hidden
+      t.references :source, index: true, foreign_key: true
+    end
+    add_index :measurements, :source_id
+  end
+end
diff --git a/db/migrate/004_create_readouts.rb b/db/migrate/004_create_readouts.rb
new file mode 100644
index 0000000..043828f
--- /dev/null
+++ b/db/migrate/004_create_readouts.rb
@@ -0,0 +1,12 @@
+class CreateReadouts < ActiveRecord::Migration
+  def change
+    create_table :readouts do |t|
+      t.references :measurement, index: true, foreign_key: true
+      t.references :quantity, index: true, foreign_key: true
+      t.references :unit, index: true, foreign_key: true
+    end
+    add_index :readouts, :measurement_id
+    add_index :readouts, :quantity_id
+    add_index :readouts, :unit_id
+  end
+end
diff --git a/db/migrate/005_create_readout_values.rb b/db/migrate/005_create_readout_values.rb
new file mode 100644
index 0000000..d7d311f
--- /dev/null
+++ b/db/migrate/005_create_readout_values.rb
@@ -0,0 +1,10 @@
+class CreateReadoutValues < ActiveRecord::Migration
+  def change
+    create_table :readout_values do |t|
+      t.references :readout, index: true, foreign_key: true
+      t.decimal :value
+      t.timestamp :taken_at
+    end
+    add_index :readout_values, :readout_id
+  end
+end
diff --git a/test/unit/measurement_test.rb b/test/unit/measurement_test.rb
new file mode 100644
index 0000000..588c04f
--- /dev/null
+++ b/test/unit/measurement_test.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../test_helper', __FILE__)
+
+class MeasurementTest < ActiveSupport::TestCase
+
+  # Replace this with your real tests.
+  def test_truth
+    assert true
+  end
+end
diff --git a/test/unit/readout_test.rb b/test/unit/readout_test.rb
new file mode 100644
index 0000000..f48f9ec
--- /dev/null
+++ b/test/unit/readout_test.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../test_helper', __FILE__)
+
+class ReadoutTest < ActiveSupport::TestCase
+
+  # Replace this with your real tests.
+  def test_truth
+    assert true
+  end
+end
diff --git a/test/unit/readout_value_test.rb b/test/unit/readout_value_test.rb
new file mode 100644
index 0000000..22e5ee2
--- /dev/null
+++ b/test/unit/readout_value_test.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../test_helper', __FILE__)
+
+class ReadoutValueTest < ActiveSupport::TestCase
+
+  # Replace this with your real tests.
+  def test_truth
+    assert true
+  end
+end