diff --git a/mpone/visa/__init__.py b/mpone/visa/__init__.py
index c665b27..5c80de5 100644
--- a/mpone/visa/__init__.py
+++ b/mpone/visa/__init__.py
@@ -51,7 +51,7 @@ def set(self, **set_dict):
                 self.man.set_Output(Output_STATE)
 
     def measure(self, measure_func_=None):
-        if self.inst_type == "tek_2636B" and measure_func_ is not None:
+        if self.inst_type == "tek_2636B" and measure_func_:
             return self.man.measure(measure_func_)
         return self.man.measure()
 
diff --git a/quick_debug.py b/quick_debug.py
index a377a08..0fc02f9 100644
--- a/quick_debug.py
+++ b/quick_debug.py
@@ -17,7 +17,7 @@
 
 while True:
     
-    command = input(f"In[{n}]@ ")
+    command = input(f"In [{n}]@ ")
     if command == "exit":
         break
     elif command[:2] == "q-":
diff --git a/requirements.txt b/requirements.txt
index dbaf6d3..2cca268 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
 pyvisa>=1.13.0
-flet>=0.4.0
 plotly>=5.13.0
 numpy>=1.24.2
 matplotlib>=3.6.3