diff --git a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatScreenInfo.java b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatScreenInfo.java
new file mode 100644
index 00000000..d7c0e745
--- /dev/null
+++ b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatScreenInfo.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.testing;
+
+import java.awt.DisplayMode;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
+import java.awt.Insets;
+import java.awt.Rectangle;
+import java.awt.Toolkit;
+import java.awt.geom.AffineTransform;
+import javax.swing.SwingUtilities;
+
+/**
+ * Displays information about screens connected to a computer.
+ *
+ * This is a single-file program that can be compiled/run without any other
+ * FlatLaf code or dependencies.
+ *
+ * Since Java 11, you can run this program from source with:
+ *     java FlatScreenInfo.java
+ *
+ * @author Karl Tauber
+ */
+public class FlatScreenInfo
+{
+	public static void main( String[] args ) {
+		SwingUtilities.invokeLater( () -> {
+			printScreenInfo();
+		} );
+	}
+
+	private static void printScreenInfo() {
+		Toolkit toolkit = Toolkit.getDefaultToolkit();
+		GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();
+		GraphicsDevice defaultScreenDevice = graphicsEnvironment.getDefaultScreenDevice();
+		GraphicsDevice[] screenDevices = graphicsEnvironment.getScreenDevices();
+
+		System.out.print( "Scale factors:  " );
+		for( GraphicsDevice gd : screenDevices ) {
+			GraphicsConfiguration gc = gd.getDefaultConfiguration();
+
+			if( gd != screenDevices[0] )
+				System.out.print( " / " );
+
+			System.out.print( (int) (gc.getDefaultTransform().getScaleX() * 100) );
+			System.out.print( "%" );
+		}
+		System.out.println();
+
+		System.out.println( "Java version:   " + System.getProperty( "java.version" ) );
+
+		for( GraphicsDevice gd : screenDevices ) {
+			GraphicsConfiguration gc = gd.getDefaultConfiguration();
+			DisplayMode displayMode = gd.getDisplayMode();
+			Rectangle bounds = gc.getBounds();
+			int width = displayMode.getWidth();
+			int height = displayMode.getHeight();
+			double boundsScaleX = (bounds.width > width)
+				? (double) bounds.width / (double) width
+				: -((double) width / (double) bounds.width);
+			double boundsScaleY = (bounds.height > height)
+				? (double) bounds.height / (double) height
+				: -((double) height / (double) bounds.height);
+			boundsScaleX = Math.round( boundsScaleX * 1000. ) / 1000.;
+			boundsScaleY = Math.round( boundsScaleY * 1000. ) / 1000.;
+			Insets screenInsets = toolkit.getScreenInsets( gc );
+			AffineTransform defaultTransform = gc.getDefaultTransform();
+			double scaleX = defaultTransform.getScaleX();
+			double scaleY = defaultTransform.getScaleY();
+
+			System.out.println();
+			System.out.print( "ID:      " + gd.getIDstring() );
+			if( gd == defaultScreenDevice )
+				System.out.print( " (main)" );
+			System.out.println();
+
+			System.out.printf( "Size:    %d x %d / %d Bit / %d Hz%n",
+				displayMode.getWidth(), displayMode.getHeight(),
+				displayMode.getBitDepth(), displayMode.getRefreshRate() );
+			System.out.printf( "Bounds:  %d x %d / x %d / y %d",
+				bounds.width, bounds.height, bounds.x, bounds.y );
+			if( Math.abs( boundsScaleX ) != 1 || Math.abs( boundsScaleY ) != 1 )
+				System.out.printf( "   (scale %s)", toString( boundsScaleX, boundsScaleY ) );
+			System.out.println();
+			System.out.printf( "Insets:  left %d / right %d / top %d / bottom %d%n",
+				screenInsets.left, screenInsets.right, screenInsets.top, screenInsets.bottom );
+			System.out.println( "Scale:   " + toString( scaleX, scaleY ) );
+		}
+	}
+
+	private static String toString( double scaleX, double scaleY ) {
+		return (scaleX == scaleY)
+			? String.valueOf( scaleX )
+			: scaleX + " / " + scaleY;
+	}
+}