diff --git a/TBF/UI/Procedures/TestWizard/FlowSelection.cs b/TBF/UI/Procedures/TestWizard/FlowSelection.cs
index d64c4e365..0f3c705aa 100644
--- a/TBF/UI/Procedures/TestWizard/FlowSelection.cs
+++ b/TBF/UI/Procedures/TestWizard/FlowSelection.cs
@@ -102,13 +102,13 @@ namespace TBF.UI.Procedures.TestWizard
                 case QSpec.Q_dPct:
                     var Q2 = Units.ConvertFrom(flowUnit, Utils.ParseUDouble(q3TextBox.Text));
                     var dQpct = Utils.ParseUDouble(dQpctTextBox.Text);
-                    qFrom = (float)(Q2 * (1 - dQpct / 100.0));
-                    qTo = (float)(Q2 * (1 + dQpct / 100.0));
+                    qFrom = (Q2 * (1 - dQpct / 100.0));
+                    qTo = (Q2 * (1 + dQpct / 100.0));
                     break;
             }
 
-            test.Qfrom = (float)qFrom;
-            test.Qto = (float)qTo;
+            test.Qfrom = qFrom;
+            test.Qto = qTo;
             test.FlowUnit = flowUnit;
 
 			if (sensorsComboBox.Items.Contains(sensorsComboBox.Text))
@@ -119,23 +119,23 @@ namespace TBF.UI.Procedures.TestWizard
 
 		bool IsFormValid()
 		{
-			float dummy;
+			double dummy;
             switch (qSpec)
             {
                 default:
                 case QSpec.Qfrom_Qto:
-                    return Utils.TryParseUFloat(qFromTextBox.Text, out dummy) &&
-                           Utils.TryParseUFloat(qToTextBox.Text, out dummy) &&
+                    return Utils.TryParseUDouble(qFromTextBox.Text, out dummy) &&
+                           Utils.TryParseUDouble(qToTextBox.Text, out dummy) &&
                            sensorsComboBox.Items.Contains(sensorsComboBox.Text);
 
                 case QSpec.Q_dQ:
-                    return Utils.TryParseUFloat(q2TextBox.Text, out dummy) &&
-                           Utils.TryParseUFloat(dQTextBox.Text, out dummy) &&
+                    return Utils.TryParseUDouble(q2TextBox.Text, out dummy) &&
+                           Utils.TryParseUDouble(dQTextBox.Text, out dummy) &&
                            sensorsComboBox.Items.Contains(sensorsComboBox.Text);
 
                 case QSpec.Q_dPct:
-                    return Utils.TryParseUFloat(q3TextBox.Text, out dummy) &&
-                           Utils.TryParseUFloat(dQpctTextBox.Text, out dummy) &&
+                    return Utils.TryParseUDouble(q3TextBox.Text, out dummy) &&
+                           Utils.TryParseUDouble(dQpctTextBox.Text, out dummy) &&
                            sensorsComboBox.Items.Contains(sensorsComboBox.Text);
             }
 		}
@@ -173,7 +173,7 @@ namespace TBF.UI.Procedures.TestWizard
 
         private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
         {
-            double Q1,Q2;
+            double Q1, Q2;
 
             switch ((QSpec)tabControl1.SelectedIndex)
             {