diff --git a/doc/img/MainWindow_spectrum_gui.png b/doc/img/MainWindow_spectrum_gui.png
index 73c8175bc..18b4da1b7 100644
Binary files a/doc/img/MainWindow_spectrum_gui.png and b/doc/img/MainWindow_spectrum_gui.png differ
diff --git a/doc/img/MainWindow_spectrum_gui.xcf b/doc/img/MainWindow_spectrum_gui.xcf
index 1f2358486..c0a8f49f1 100644
Binary files a/doc/img/MainWindow_spectrum_gui.xcf and b/doc/img/MainWindow_spectrum_gui.xcf differ
diff --git a/sdrgui/gui/glspectrumgui.cpp b/sdrgui/gui/glspectrumgui.cpp
index 914b0ade2..3997c29c3 100644
--- a/sdrgui/gui/glspectrumgui.cpp
+++ b/sdrgui/gui/glspectrumgui.cpp
@@ -19,6 +19,9 @@
 // along with this program. If not, see <http://www.gnu.org/licenses/>.          //
 ///////////////////////////////////////////////////////////////////////////////////
 
+#include <QLineEdit>
+#include <QToolTip>
+
 #include "gui/glspectrumgui.h"
 #include "dsp/fftwindow.h"
 #include "dsp/spectrumvis.h"
@@ -38,15 +41,18 @@ GLSpectrumGUI::GLSpectrumGUI(QWidget* parent) :
 	ui->setupUi(this);
 	on_linscale_toggled(false);
 
-    ui->refLevel->clear();
-	for(int ref = 0; ref >= -110; ref -= 5) {
-		ui->refLevel->addItem(QString("%1").arg(ref));
-    }
+    QString levelStyle = QString(
+        "QSpinBox {background-color: rgb(79, 79, 79);}"
+        "QLineEdit {color: white; background-color: rgb(79, 79, 79); border: 1px solid gray; border-radius: 4px;}"
+        "QTooltip {color: white; background-color: balck;}"
+    );
+    ui->refLevel->setStyleSheet(levelStyle);
+    ui->levelRange->setStyleSheet(levelStyle);
+    // ui->refLevel->findChild<QLineEdit*>()->setStyleSheet("color: white; background-color: rgb(79, 79, 79); border: 1px solid gray; border-radius: 4px; ");
+    // ui->refLevel->setStyleSheet("background-color: rgb(79, 79, 79);");
 
-	ui->levelRange->clear();
-	for(int range = 100; range >= 5; range -= 5) {
-		ui->levelRange->addItem(QString("%1").arg(range));
-    }
+    // ui->levelRange->findChild<QLineEdit*>()->setStyleSheet("color: white; background-color: rgb(79, 79, 79); border: 1px solid gray; border-radius: 4px;");
+    // ui->levelRange->setStyleSheet("background-color: rgb(79, 79, 79);");
 
 	connect(&m_messageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
 
@@ -101,8 +107,8 @@ bool GLSpectrumGUI::deserialize(const QByteArray& data)
 void GLSpectrumGUI::displaySettings()
 {
     blockApplySettings(true);
-	ui->refLevel->setCurrentIndex(-m_settings.m_refLevel / 5);
-	ui->levelRange->setCurrentIndex((100 - m_settings.m_powerRange) / 5);
+	ui->refLevel->setValue(m_settings.m_refLevel);
+	ui->levelRange->setValue(m_settings.m_powerRange);
 	ui->decay->setSliderPosition(m_settings.m_decay);
 	ui->decayDivisor->setSliderPosition(m_settings.m_decayDivisor);
 	ui->stroke->setSliderPosition(m_settings.m_histogramStroke);
@@ -252,15 +258,15 @@ void GLSpectrumGUI::on_wsSpectrum_toggled(bool checked)
     }
 }
 
-void GLSpectrumGUI::on_refLevel_currentIndexChanged(int index)
+void GLSpectrumGUI::on_refLevel_valueChanged(int value)
 {
-	m_settings.m_refLevel = 0 - index * 5;
+	m_settings.m_refLevel = value;
     applySettings();
 }
 
-void GLSpectrumGUI::on_levelRange_currentIndexChanged(int index)
+void GLSpectrumGUI::on_levelRange_valueChanged(int value)
 {
-	m_settings.m_powerRange = 100 - index * 5;
+	m_settings.m_powerRange = value;
     applySettings();
 }
 
diff --git a/sdrgui/gui/glspectrumgui.h b/sdrgui/gui/glspectrumgui.h
index 0954d630c..9d324b287 100644
--- a/sdrgui/gui/glspectrumgui.h
+++ b/sdrgui/gui/glspectrumgui.h
@@ -84,8 +84,8 @@ private:
 private slots:
 	void on_fftWindow_currentIndexChanged(int index);
 	void on_fftSize_currentIndexChanged(int index);
-	void on_refLevel_currentIndexChanged(int index);
-	void on_levelRange_currentIndexChanged(int index);
+	void on_refLevel_valueChanged(int value);
+	void on_levelRange_valueChanged(int value);
 	void on_decay_valueChanged(int index);
 	void on_decayDivisor_valueChanged(int index);
 	void on_stroke_valueChanged(int index);
diff --git a/sdrgui/gui/glspectrumgui.ui b/sdrgui/gui/glspectrumgui.ui
index 4f098600b..08b5b9857 100644
--- a/sdrgui/gui/glspectrumgui.ui
+++ b/sdrgui/gui/glspectrumgui.ui
@@ -453,17 +453,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="refLevel">
-       <property name="sizePolicy">
-        <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
-         <horstretch>0</horstretch>
-         <verstretch>0</verstretch>
-        </sizepolicy>
-       </property>
+      <widget class="QSpinBox" name="refLevel">
        <property name="minimumSize">
         <size>
          <width>50</width>
-         <height>0</height>
+         <height>24</height>
         </size>
        </property>
        <property name="maximumSize">
@@ -475,38 +469,23 @@
        <property name="toolTip">
         <string>Reference level (dB)</string>
        </property>
-       <property name="sizeAdjustPolicy">
-        <enum>QComboBox::AdjustToContents</enum>
+       <property name="alignment">
+        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+       </property>
+       <property name="minimum">
+        <number>-110</number>
+       </property>
+       <property name="maximum">
+        <number>0</number>
        </property>
-       <item>
-        <property name="text">
-         <string>0</string>
-        </property>
-       </item>
-       <item>
-        <property name="text">
-         <string>-5</string>
-        </property>
-       </item>
-       <item>
-        <property name="text">
-         <string>-10</string>
-        </property>
-       </item>
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="levelRange">
-       <property name="sizePolicy">
-        <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
-         <horstretch>0</horstretch>
-         <verstretch>0</verstretch>
-        </sizepolicy>
-       </property>
+      <widget class="QSpinBox" name="levelRange">
        <property name="minimumSize">
         <size>
          <width>45</width>
-         <height>0</height>
+         <height>24</height>
         </size>
        </property>
        <property name="maximumSize">
@@ -518,24 +497,15 @@
        <property name="toolTip">
         <string>Range (dB)</string>
        </property>
-       <property name="sizeAdjustPolicy">
-        <enum>QComboBox::AdjustToContents</enum>
+       <property name="alignment">
+        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+       </property>
+       <property name="minimum">
+        <number>1</number>
+       </property>
+       <property name="maximum">
+        <number>100</number>
        </property>
-       <item>
-        <property name="text">
-         <string>100</string>
-        </property>
-       </item>
-       <item>
-        <property name="text">
-         <string>50</string>
-        </property>
-       </item>
-       <item>
-        <property name="text">
-         <string>5</string>
-        </property>
-       </item>
       </widget>
      </item>
      <item>
diff --git a/sdrgui/readme.md b/sdrgui/readme.md
index 44e16eeb9..7f87e87ff 100644
--- a/sdrgui/readme.md
+++ b/sdrgui/readme.md
@@ -378,11 +378,11 @@ Select the size of the FFT window among these values:
 
 <h4>4.3. Reference level</h4>
 
-This is the level in dB at the top of the display range. You can select values between 0 and -110 in 5 dB steps
+This is the level in dB at the top of the display range. You can select values between 0 and -110 in 1 dB steps
 
 <h4>4.4. Range</h4>
 
-This is the range of display in dB. You can select values between 5 and 100 in 5 dB steps
+This is the range of display in dB. You can select values between 1 and 100 in 1 dB steps
 
 <h4>4.5. Averaging mode</h4>