diff --git a/src/handler/mhz19_co2.py b/src/handler/mhz19_co2.py
index 925308b..79aa9a1 100644
--- a/src/handler/mhz19_co2.py
+++ b/src/handler/mhz19_co2.py
@@ -14,6 +14,7 @@ class Mhz19Co2:
 
     def read(self) -> int | None:
         data = mh_z19.read()
+        logging.debug(str(data))
 
         if not data:
             return None