diff --git a/db.py b/db.py
index a1091bb..c1a7313 100755
--- a/db.py
+++ b/db.py
@@ -46,18 +46,23 @@ if __name__ == '__main__':
 class Object:
     @staticmethod
     def select_args() -> str:
-        return 'id, name'
+        return 'id, name, calibrated'
 
-    def __init__(self, object_id: int, name: str):
+    def __init__(self, object_id: int, name: str, calibrated: int):
         self.id = object_id
         self.name = name
 
+        # 0 means no data available
+        # 1 means data available but calibration not done
+        # 2 means calibration done
+        self.calibrated = calibrated
+
     @staticmethod
     def create(name: str, db: sqlite3.Connection) -> 'Object':
         cur = db.cursor()
         response = cur.execute(
-            'INSERT INTO object(name) VALUES (?) RETURNING ' + Object.select_args() + ';',
-            [name]
+            'INSERT INTO object(name, calibrated) VALUES (?, ?) RETURNING ' + Object.select_args() + ';',
+            [name, 0]
         )
         return response.fetchone()
 
diff --git a/schema.sql b/schema.sql
index f9cc648..2b8db13 100644
--- a/schema.sql
+++ b/schema.sql
@@ -2,5 +2,6 @@ DROP TABLE IF EXISTS object;
 
 CREATE TABLE object (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
-    name TEXT NOT NULL
+    name TEXT NOT NULL,
+    calibrated INT NOT NULL
 );
diff --git a/templates/object.html b/templates/object.html
index 43068cd..8216640 100644
--- a/templates/object.html
+++ b/templates/object.html
@@ -6,10 +6,22 @@
         <h1 class="title">{{ object.name }}</h1>
         <div class="field is-grouped is-grouped-multiline">
             <div class="control">
-                <a href="/calibration/{{ object.id }}" class="tags has-addons">
-                    <span class="tag is-dark">étalonnage</span>
-                    <span class="tag is-success">fait</span>
-                </a>
+                {% if object.calibrated == 0 %}
+                    <span class="tags has-addons">
+                        <span class="tag is-dark">étalonnage</span>
+                        <span class="tag is-danger">données manquantes</span>
+                    </span>
+                {% elif object.calibrated == 1 %}
+                    <span class="tags has-addons">
+                        <span class="tag is-dark">étalonnage</span>
+                        <span class="tag is-warning">pas fait</span>
+                    </span>
+                {% elif object.calibrated == 2 %}
+                    <a href="/calibration/{{ object.id }}" class="tags has-addons">
+                        <span class="tag is-dark">étalonnage</span>
+                        <span class="tag is-success">fait</span>
+                    </a>
+                {% endif %}
             </div>
         </div>
     </div>