diff --git a/db/scitemcustom.php b/db/scitemcustom.php
index 2647f25..4e3d04c 100644
--- a/db/scitemcustom.php
+++ b/db/scitemcustom.php
@@ -9,6 +9,14 @@ function scitemcustom_column_exists(PDO $db, string $table, string $column): boo
     return (bool) $stmt->fetch();
 }
 
+function scitemcustom_column_definition(PDO $db, string $table, string $column): ?array
+{
+    $stmt = $db->query("SHOW COLUMNS FROM `{$table}` LIKE " . $db->quote($column));
+    $column_definition = $stmt->fetch(PDO::FETCH_ASSOC);
+
+    return $column_definition ?: null;
+}
+
 function scitemcustom_index_exists(PDO $db, string $table, string $index): bool
 {
     $stmt = $db->query("SHOW INDEX FROM `{$table}` WHERE Key_name = " . $db->quote($index));
@@ -105,7 +113,7 @@ function scitemcustom_bootstrap(): void
             cl_scitemcustomstat_id INT(11) NOT NULL AUTO_INCREMENT,
             cl_scitemcustomstat_itemcustom_id INT(11) NOT NULL,
             cl_scitemcustomstat_stat_id INT(11) NOT NULL,
-            cl_scitemcustomstat_sign ENUM('+', '-') NOT NULL DEFAULT '+',
+            cl_scitemcustomstat_sign ENUM('+', '', '-') NOT NULL DEFAULT '+',
             cl_scitemcustomstat_value DECIMAL(10,2) NOT NULL DEFAULT 0.00,
             cl_scitemcustomstat_created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
             PRIMARY KEY (cl_scitemcustomstat_id),
@@ -123,5 +131,13 @@ function scitemcustom_bootstrap(): void
         ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
     );
 
+    $sign_column = scitemcustom_column_definition($db, 'tbl_scitemcustomstat', 'cl_scitemcustomstat_sign');
+    if ($sign_column && ($sign_column['Type'] ?? '') !== "enum('+','','-')") {
+        $db->exec(
+            "ALTER TABLE tbl_scitemcustomstat
+             MODIFY COLUMN cl_scitemcustomstat_sign ENUM('+', '', '-') NOT NULL DEFAULT '+'"
+        );
+    }
+
     $scitemcustom_bootstrap_done = true;
 }
diff --git a/scitemcustom.php b/scitemcustom.php
index acf7466..179f3f4 100644
--- a/scitemcustom.php
+++ b/scitemcustom.php
@@ -16,7 +16,15 @@ if (!auth_is_admin()) {
 
 function scitemcustom_normalize_sign(?string $sign): string
 {
-    return $sign === '-' ? '-' : '+';
+    if ($sign === '-') {
+        return '-';
+    }
+
+    if ($sign === '+') {
+        return '+';
+    }
+
+    return '';
 }
 
 function scitemcustom_normalize_value(?string $value): ?string
@@ -43,7 +51,9 @@ function scitemcustom_display_value($value): string
 
 function scitemcustom_preview(string $sign, $value, string $unit): string
 {
-    return ($sign === '-' ? '-' : '+') . scitemcustom_display_value($value) . $unit;
+    $prefix = $sign === '-' ? '-' : ($sign === '+' ? '+' : '');
+
+    return $prefix . scitemcustom_display_value($value) . $unit;
 }
 
 function scitemcustom_current_owner_auth_id(PDO $db): int
@@ -70,7 +80,8 @@ $flash_message = $flash['message'] ?? '';
 
 $db = db();
 $csrf_token = auth_csrf_token();
-$allowed_signs = ['+', '-'];
+$allowed_signs = ['+', '', '-'];
+$sign_labels = ['+' => '+', '' => 'Aucun', '-' => '-'];
 $current_owner_auth_id = scitemcustom_current_owner_auth_id($db);
 
 if ($current_owner_auth_id <= 0) {
@@ -871,8 +882,11 @@ $current_session_user = $_SESSION['user'] ?? '';
                                                 <div class="form-group" style="margin-bottom:0;">
                                                     <label>Signe</label>
                                                     <select name="sign" class="form-control">
-                                                        <option value="+" selected>+</option>
-                                                        <option value="-">-</option>
+                                                        <?php foreach ($allowed_signs as $sign_option): ?>
+                                                            <option value="<?php echo htmlspecialchars($sign_option, ENT_QUOTES, 'UTF-8'); ?>" <?php echo $sign_option === '+' ? 'selected' : ''; ?>>
+                                                                <?php echo htmlspecialchars($sign_labels[$sign_option], ENT_QUOTES, 'UTF-8'); ?>
+                                                            </option>
+                                                        <?php endforeach; ?>
                                                     </select>
                                                 </div>
 
@@ -923,7 +937,7 @@ $current_session_user = $_SESSION['user'] ?? '';
                                                                     <select name="sign" class="form-control">
                                                                         <?php foreach ($allowed_signs as $sign_option): ?>
                                                                             <option value="<?php echo htmlspecialchars($sign_option, ENT_QUOTES, 'UTF-8'); ?>" <?php echo $sign_option === $item_stat['cl_scitemcustomstat_sign'] ? 'selected' : ''; ?>>
-                                                                                <?php echo htmlspecialchars($sign_option, ENT_QUOTES, 'UTF-8'); ?>
+                                                                                <?php echo htmlspecialchars($sign_labels[$sign_option], ENT_QUOTES, 'UTF-8'); ?>
                                                                             </option>
                                                                         <?php endforeach; ?>
                                                                     </select>
diff --git a/scstatsitem.php b/scstatsitem.php
index cfd244a..0c04dad 100644
--- a/scstatsitem.php
+++ b/scstatsitem.php
@@ -19,7 +19,7 @@ $flash_message = $flash['message'] ?? '';
 $db = db();
 $csrf_token = auth_csrf_token();
 
-$allowed_units = ['%', '°C', 'RPM'];
+$allowed_units = ['%', '°C', 'RPM', 'Q', 'SCU'];
 
 
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {