diff --git a/helper.go b/helper.go
index e21f3ed..0171a3e 100644
--- a/helper.go
+++ b/helper.go
@@ -12,6 +12,9 @@ func Contains(a []string, x string) bool {
 		if x == n {
 			return true
 		}
+		if "@" + x == n {
+			return true
+		}
 	}
 	return false
 }
diff --git a/main.go b/main.go
index 01e7bd8..e602a02 100644
--- a/main.go
+++ b/main.go
@@ -6,6 +6,7 @@ import (
 	"os"
 	"path"
 	"time"
+        "strings"
 )
 
 func serveTemplate(w http.ResponseWriter, r *http.Request) {
@@ -47,7 +48,14 @@ func serveTemplate(w http.ResponseWriter, r *http.Request) {
 	if r.URL.Path == "/scales.html" {
 		// wir holen noch die letzten Metriken
 		for _, v := range scales {
-			last_metric := getLastMetrics(v)
+			deveui := v
+			readonly := false
+			if strings.HasPrefix(deveui, "@") {
+				deveui = deveui[1:]
+				readonly = true
+			}
+			last_metric := getLastMetrics(deveui)
+			last_metric.Readonly = readonly
 			last_metrics = append(last_metrics, last_metric)
 		}
 	}
diff --git a/metrics.go b/metrics.go
index bade870..9c5f2ed 100644
--- a/metrics.go
+++ b/metrics.go
@@ -15,6 +15,7 @@ import (
 type OneMetric struct {
 	Deveui               string
 	Alias                string
+	Readonly             bool
 	Alarmactive          string
 	Smsnumber            string
 	Timestamp            string
@@ -346,6 +347,7 @@ func getLastMetrics(deveui string) OneMetric {
 	}
 	res.Deveui = deveui
 	res.Alias = getDevAlias(deveui)
+	res.Readonly = false
 	res.Alarmactive = getDevAlarmactive(deveui)
 	res.Smsnumber = getDevSmsnumber(deveui)
 	res.ActiveUntil = getActiveUntil(deveui)
diff --git a/snippets/scales.html b/snippets/scales.html
index c766411..d155225 100644
--- a/snippets/scales.html
+++ b/snippets/scales.html
@@ -106,7 +106,7 @@ Sie erhalten eine E-Mail, sobald die Zahlung erfolgreich abgeschlossen ist.
 
 {{range .LastMetrics}}
 <div class="column waage is-full notification is-warning">
-  <p class="is-size-2 is-size-5-mobile has-text-centered has-text-weight-bold" ><span class="alias" id="alias_{{.Deveui}}">{{.Alias}}</span><a class="show-modal" class="block-link"><span style="float:right;" class="icon is-size-4 is-size-5-mobile"><i class="fa fa-cog"></i></span></a></p>
+  <p class="is-size-2 is-size-5-mobile has-text-centered has-text-weight-bold" ><span class="alias" id="alias_{{.Deveui}}">{{.Alias}}</span>{{ if not .Readonly }}<a class="show-modal" class="block-link"><span style="float:right;" class="icon is-size-4 is-size-5-mobile"><i class="fa fa-cog"></i></span></a>{{ end }}</p>
   <p id="alarmactive_{{.Deveui}}" hidden>{{.Alarmactive}}</p>
   <p id="smsnumber_{{.Deveui}}" hidden>{{.Smsnumber}}</p>
   <p id="lastmeasurement_{{.Deveui}}" class="has-text-centered">letzte &uuml;bermittelte Messung: {{.Timestamp}}</p>