diff --git a/src/gui/settingsdialog.cpp b/src/gui/settingsdialog.cpp
index ab19d54..a7533fb 100644
--- a/src/gui/settingsdialog.cpp
+++ b/src/gui/settingsdialog.cpp
@@ -6,6 +6,7 @@
 #include <posprinter.h>
 
 #include <exception>
+#include <stdexcept>
 
 #include <QMessageBox>
 #include <QSettings>
@@ -35,19 +36,33 @@ SettingsDialog::SettingsDialog(QWidget* parent, Qt::WindowFlags f) : QDialog(par
                 PosPrinter printer;
                 printer.printTest();
             } else {
-                
-            }
-            /* if (printer.isValid())
-                this->ui_.posPrinterDeviceEdit->setText("<gefunden>");
-            else
-                this->ui_.posPrinterDeviceEdit->setText("<nicht gefunden>"); */
+                std::string posPrinterDeviceString = ui_.posPrinterDeviceEdit->text().toStdString();
+                std::string delimiter = ":";
+                PrinterDevice printerDevice;
+                try {
+                    printerDevice.idVendor = std::stoi(
+                        posPrinterDeviceString.substr(0, posPrinterDeviceString.find(delimiter)), 0,
+                        16);
+                    printerDevice.idProduct = std::stoi(
+                        posPrinterDeviceString.substr(posPrinterDeviceString.find(delimiter) + 1),
+                        0, 16);
+                } catch (std::exception&) {
+                    QMessageBox(QMessageBox::Icon::Warning, "Falsche Eingabe",
+                                QString("Eingabeformat für den Bondrucker (hexadezimale IDs): "
+                                        "<VendorID>:<ProductID>\nBeispiel: 0416:5011"),
+                                QMessageBox::StandardButton::Ok, this)
+                        .exec();
+                    return;
+                }
 
+                PosPrinter printer(printerDevice);
+                printer.printTest();
+            }
         } catch (std::runtime_error& err) {
             QMessageBox(QMessageBox::Icon::Warning, "Bondrucker Fehler",
                         QString("Test schlug fehl: ") + err.what(), QMessageBox::StandardButton::Ok,
                         this)
                 .exec();
-            // this->ui_.posPrinterDeviceEdit->setText("<Fehler>");
             return;
         }
     });
diff --git a/src/printer/posprinter.cpp b/src/printer/posprinter.cpp
index f81ade3..0fc1961 100644
--- a/src/printer/posprinter.cpp
+++ b/src/printer/posprinter.cpp
@@ -20,7 +20,13 @@ const std::string PosPrinter::Command::FONT_SIZE_BIG = {'\x1b', '\x21', '\x10'};
 const std::string PosPrinter::Command::FONT_SIZE_NORMAL = {'\x1b', '\x21', '\x00'};
 const std::string PosPrinter::Command::FEED = {0x1b, 0x64, 0x03};
 
-PosPrinter::PosPrinter()
+PosPrinter::PosPrinter() : PosPrinter(PrinterDevice())
+{
+    
+}
+
+PosPrinter::PosPrinter(const PrinterDevice& printerDevice)
+    : printerDevice_(printerDevice)
 {
     int retValue;
 
@@ -53,6 +59,7 @@ PosPrinter::PosPrinter()
             if (desc.idVendor == printerDevice_.idVendor &&
                 desc.idProduct == printerDevice_.idProduct) {
                 numDevice = i;
+                break;
             }
         }
     }
@@ -85,11 +92,6 @@ PosPrinter::PosPrinter()
     libusb_free_device_list(devList, 1);
 }
 
-PosPrinter::PosPrinter(const PrinterDevice& printerDevice) : printerDevice_{printerDevice}
-{
-    PosPrinter();
-}
-
 PosPrinter::~PosPrinter()
 {
     if (devicePtr_) {
diff --git a/src/printer/posprinter.h b/src/printer/posprinter.h
index f3b9f65..04db2f1 100644
--- a/src/printer/posprinter.h
+++ b/src/printer/posprinter.h
@@ -49,7 +49,7 @@ class PosPrinter
     libusb_context* contextPtr_{};
     libusb_device_handle* devicePtr_{};
     SupportedPrinters supportedPrinters_;
-    PrinterDevice printerDevice_;
+    PrinterDevice printerDevice_{};
 };
 
 #endif
\ No newline at end of file