diff --git a/frappy_psi/lakeshore.py b/frappy_psi/lakeshore.py
index 2ebe1e6..e27b0eb 100644
--- a/frappy_psi/lakeshore.py
+++ b/frappy_psi/lakeshore.py
@@ -35,7 +35,7 @@ class Ls340IO(StringIO):
 
 class LakeShore(HasIO):
     def set_par(self, cmd, *args):
-        head = cmd + ','.join([str(a) for a in args])
+        head = ','.join([cmd] + [f'{a:g}' for a in args])
         tail = cmd.replace(' ', '? ')
         reply = self.communicate(f'{head};{tail}')
         return [float(num) for num in reply.split(',')]