diff --git a/mccs-it/thermal/public/index.html b/mccs-it/thermal/public/index.html
index f96c119..7783eb1 100644
--- a/mccs-it/thermal/public/index.html
+++ b/mccs-it/thermal/public/index.html
@@ -12,8 +12,11 @@
     <script>
         document.getElementById('testPrintBtn').addEventListener('click', () => {
             fetch('/test-print', { method: 'POST' })
-                .then(response => response.json())
-                .then(data => alert(data.message))
+                .then(response => response.blob())
+                .then(blob => {
+                    const url = URL.createObjectURL(blob);
+                    window.open(url);
+                })
                 .catch(error => alert('Error: ' + error));
         });
     </script>