diff --git a/app/Models/CharacteristicValue.php b/app/Models/CharacteristicValue.php
index 8a292b0..e190168 100644
--- a/app/Models/CharacteristicValue.php
+++ b/app/Models/CharacteristicValue.php
@@ -19,6 +19,7 @@ class CharacteristicValue extends Model
         'process_order',
         'coil_number',
         'status',
+        'observed_value',
         'created_at',
         'updated_at',
         'created_by',