diff --git a/Heizung_x_Stufig/form.json b/Heizung_x_Stufig/form.json
index 6c28381..c733f96 100644
--- a/Heizung_x_Stufig/form.json
+++ b/Heizung_x_Stufig/form.json
@@ -38,9 +38,10 @@
             "suffix": ""
         },
         {
-            "type": "ValidationTextBox",
+            "type": "NumberSpinner",
             "name": "Hysterese",
-            "caption": "Hysterese z.B. 0.1"
+            "caption": "Hysterese z.B. 0.1",
+            "suffix": "°C"
         },
         {
             "type": "List",