diff --git a/Polyhedron/demo/Polyhedron/CGAL_double_edit.cpp b/Polyhedron/demo/Polyhedron/CGAL_double_edit.cpp
index a50aef4180b2..9f6f4c9b5a27 100644
--- a/Polyhedron/demo/Polyhedron/CGAL_double_edit.cpp
+++ b/Polyhedron/demo/Polyhedron/CGAL_double_edit.cpp
@@ -19,7 +19,6 @@ class DoubleValidator : public QDoubleValidator
   }
   QValidator::State validate ( QString & input, int & pos ) const
   {
-    fixup(input);
     return QDoubleValidator::validate(input, pos);
   }
 };
@@ -59,7 +58,7 @@ class DoubleValidator : public QDoubleValidator
 
   void DoubleEdit::setRange(double rmin, double rmax)
   {
-    this->validator->setRange(rmin, rmax, this->validator->decimals());
+    this->validator->setRange(rmin, rmax, -1);
   }
 
   double DoubleEdit::getValue()
diff --git a/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Mesh_3_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Mesh_3_plugin.cpp
index 521576aa657b..47f220f6e589 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Mesh_3_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Mesh_3_plugin.cpp
@@ -624,6 +624,8 @@ void Mesh_3_plugin::mesh_3(const Mesh_type mesh_type,
   ui.approx->setRange(diag * 10e-7, // min
                       diag);        // max
   ui.approx->setValue(approx);
+  ui.approx->setToolTip(tr("Approximation error: in [%1; %2]")
+                       .arg(diag * 10e-7).arg(diag));
 
   ui.protect->setEnabled(features_protection_available);
   ui.protect->setChecked(features_protection_available);