diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 591503a..105d782 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -112,10 +112,10 @@ class ClientWatcher(QObject):
     postfilter_update = pyqtSignal(list)
 
     def __init__(self, parent, client, update_s):
-        self.update_s = update_s
-        self.client = client
-        self.watch_task = None
-        self.poll_for_report = True
+        self._update_s = update_s
+        self._client = client
+        self._watch_task = None
+        self._poll_for_report = True
         super().__init__(parent)
 
     async def run(self):
@@ -123,35 +123,35 @@ class ClientWatcher(QObject):
         while True:
             time = loop.time()
             await self.update_params()
-            await asyncio.sleep(self.update_s - (loop.time() - time))
+            await asyncio.sleep(self._update_s - (loop.time() - time))
 
     async def update_params(self):
-        self.fan_update.emit(await self.client.get_fan())
-        self.pwm_update.emit(await self.client.get_pwm())
-        if self.poll_for_report:
-            self.report_update.emit(await self.client.report())
-        self.pid_update.emit(await self.client.get_pid())
-        self.thermistor_update.emit(await self.client.get_steinhart_hart())
-        self.postfilter_update.emit(await self.client.get_postfilter())
+        self.fan_update.emit(await self._client.get_fan())
+        self.pwm_update.emit(await self._client.get_pwm())
+        if self._poll_for_report:
+            self.report_update.emit(await self._client.report())
+        self.pid_update.emit(await self._client.get_pid())
+        self.thermistor_update.emit(await self._client.get_steinhart_hart())
+        self.postfilter_update.emit(await self._client.get_postfilter())
 
     def start_watching(self):
-        self.watch_task = asyncio.create_task(self.run())
+        self._watch_task = asyncio.create_task(self.run())
 
     def is_watching(self):
-        return self.watch_task is not None
+        return self._watch_task is not None
 
     @pyqtSlot()
     def stop_watching(self):
-        if self.watch_task is not None:
-            self.watch_task.cancel()
-            self.watch_task = None
+        if self._watch_task is not None:
+            self._watch_task.cancel()
+            self._watch_task = None
 
     def set_report_polling(self, enabled: bool):
-        self.poll_for_report = enabled
+        self._poll_for_report = enabled
 
     @pyqtSlot(float)
     def set_update_s(self, update_s):
-        self.update_s = update_s
+        self._update_s = update_s
 
 
 class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):