diff --git a/GUI/Model/Sim/InstrumentItems.cpp b/GUI/Model/Sim/InstrumentItems.cpp
index 2da8d01b3ba86bb4320fce0d02a0a11ce172ef67..2b7b1d7039d20261c5da237927da9a1fbe315165 100644
--- a/GUI/Model/Sim/InstrumentItems.cpp
+++ b/GUI/Model/Sim/InstrumentItems.cpp
@@ -180,9 +180,9 @@ Frame InstrumentItem::makeFrame() const
 //  ************************************************************************************************
 
 ScanningInstrumentItem::ScanningInstrumentItem(double intensity)
-    : m_scan_item(new ScanItem())
+    : m_scan(new ScanItem())
 {
-    m_scan_item->intensity().setDVal(intensity); // overwrite default value set by BeamItem c'tor
+    m_scan->intensity().setDVal(intensity); // overwrite default value set by BeamItem c'tor
 }
 
 //! Takes ownership of argument 'axis'.
@@ -228,7 +228,7 @@ void ScanningInstrumentItem::writeTo(QXmlStreamWriter* w) const
 {
     XML::writeAttribute(w, XML::Attrib::version, uint(1));
     XML::writeBaseElement<InstrumentItem>(w, this);
-    XML::writeTaggedElement(w, Tag::Scan, *m_scan_item);
+    XML::writeTaggedElement(w, Tag::Scan, *m_scan);
 }
 
 void ScanningInstrumentItem::readFrom(QXmlStreamReader* r)
@@ -241,7 +241,7 @@ void ScanningInstrumentItem::readFrom(QXmlStreamReader* r)
         if (tag == Tag::BaseData)
             XML::readBaseElement<InstrumentItem>(r, this);
         else if (tag == Tag::Scan)
-            XML::readTaggedElement(r, tag, *m_scan_item);
+            XML::readTaggedElement(r, tag, *m_scan);
         else
             r->skipCurrentElement();
     }
@@ -252,8 +252,8 @@ void ScanningInstrumentItem::readFrom(QXmlStreamReader* r)
 //  ************************************************************************************************
 
 Scatter2DInstrumentItem::Scatter2DInstrumentItem()
-    : m_beam_item(std::make_unique<BeamItem>())
-    , m_detector_item(std::make_unique<DetectorItem>())
+    : m_beam(std::make_unique<BeamItem>())
+    , m_detector(std::make_unique<DetectorItem>())
 {
     setName("GISAS");
 }
@@ -309,8 +309,8 @@ void Scatter2DInstrumentItem::writeTo(QXmlStreamWriter* w) const
 {
     XML::writeAttribute(w, XML::Attrib::version, uint(1));
     XML::writeBaseElement<InstrumentItem>(w, this);
-    XML::writeTaggedElement(w, Tag::Beam, *m_beam_item);
-    XML::writeTaggedElement(w, Tag::Detector, *m_detector_item);
+    XML::writeTaggedElement(w, Tag::Beam, *m_beam);
+    XML::writeTaggedElement(w, Tag::Detector, *m_detector);
 }
 
 void Scatter2DInstrumentItem::readFrom(QXmlStreamReader* r)
@@ -323,9 +323,9 @@ void Scatter2DInstrumentItem::readFrom(QXmlStreamReader* r)
         if (tag == Tag::BaseData)
             XML::readBaseElement<InstrumentItem>(r, this);
         else if (tag == Tag::Beam)
-            XML::readTaggedElement(r, tag, *m_beam_item);
+            XML::readTaggedElement(r, tag, *m_beam);
         else if (tag == Tag::Detector)
-            XML::readTaggedElement(r, tag, *m_detector_item);
+            XML::readTaggedElement(r, tag, *m_detector);
         else
             r->skipCurrentElement();
     }
diff --git a/GUI/Model/Sim/InstrumentItems.h b/GUI/Model/Sim/InstrumentItems.h
index d4907697436817e6d20429fc4a2323bbd6a6f3bb..6e9b669111964dd88e22b0396875eb8a6e6b3dd3 100644
--- a/GUI/Model/Sim/InstrumentItems.h
+++ b/GUI/Model/Sim/InstrumentItems.h
@@ -106,7 +106,7 @@ protected:
 class ScanningInstrumentItem : public InstrumentItem {
 public:
     ScanningInstrumentItem(double intensity);
-    ScanItem* scanItem() const { return m_scan_item.get(); }
+    ScanItem* scanItem() const { return m_scan.get(); }
 
     std::unique_ptr<PhysicalScan> createScan(const Scale& axis) const;
 
@@ -114,7 +114,7 @@ public:
     void readFrom(QXmlStreamReader* r) override;
 
 private:
-    std::unique_ptr<ScanItem> m_scan_item;
+    std::unique_ptr<ScanItem> m_scan;
 };
 
 
@@ -131,14 +131,14 @@ public:
     void writeTo(QXmlStreamWriter* w) const override;
     void readFrom(QXmlStreamReader* r) override;
 
-    BeamItem* beamItem() const { return m_beam_item.get(); }
-    DetectorItem* detectorItem() const { return m_detector_item.get(); }
+    BeamItem* beamItem() const { return m_beam.get(); }
+    DetectorItem* detectorItem() const { return m_detector.get(); }
 
     std::unique_ptr<IDetector> normalDetector() const;
 
 private:
-    std::unique_ptr<BeamItem> m_beam_item;
-    std::unique_ptr<DetectorItem> m_detector_item;
+    std::unique_ptr<BeamItem> m_beam;
+    std::unique_ptr<DetectorItem> m_detector;
 };