diff --git a/vtm/src/org/oscim/scalebar/ImperialUnitAdapter.java b/vtm/src/org/oscim/scalebar/ImperialUnitAdapter.java
index 18608c51..6933c696 100644
--- a/vtm/src/org/oscim/scalebar/ImperialUnitAdapter.java
+++ b/vtm/src/org/oscim/scalebar/ImperialUnitAdapter.java
@@ -1,6 +1,6 @@
 /*
  * Copyright 2010, 2011, 2012, 2013 mapsforge.org
- * Copyright 2016 devemux86
+ * Copyright 2016-2019 devemux86
  *
  * This program is free software: you can redistribute it and/or modify it under the
  * terms of the GNU Lesser General Public License as published by the Free Software
@@ -15,17 +15,13 @@
  */
 package org.oscim.scalebar;
 
-public final class ImperialUnitAdapter implements DistanceUnitAdapter {
+public class ImperialUnitAdapter implements DistanceUnitAdapter {
     public static final ImperialUnitAdapter INSTANCE = new ImperialUnitAdapter();
-    private static final double METER_FOOT_RATIO = 0.3048;
-    private static final int ONE_MILE = 5280;
-    private static final int[] SCALE_BAR_VALUES = {26400000, 10560000, 5280000, 2640000, 1056000, 528000, 264000,
+    public static final double METER_FOOT_RATIO = 0.3048;
+    public static final int ONE_MILE = 5280;
+    public static final int[] SCALE_BAR_VALUES = {26400000, 10560000, 5280000, 2640000, 1056000, 528000, 264000,
             105600, 52800, 26400, 10560, 5280, 2000, 1000, 500, 200, 100, 50, 20, 10, 5, 2, 1};
 
-    private ImperialUnitAdapter() {
-        // do nothing
-    }
-
     @Override
     public double getMeterRatio() {
         return METER_FOOT_RATIO;
diff --git a/vtm/src/org/oscim/scalebar/MetricUnitAdapter.java b/vtm/src/org/oscim/scalebar/MetricUnitAdapter.java
index 558e1fa5..91aacb5d 100644
--- a/vtm/src/org/oscim/scalebar/MetricUnitAdapter.java
+++ b/vtm/src/org/oscim/scalebar/MetricUnitAdapter.java
@@ -1,6 +1,6 @@
 /*
  * Copyright 2010, 2011, 2012, 2013 mapsforge.org
- * Copyright 2016 devemux86
+ * Copyright 2016-2019 devemux86
  *
  * This program is free software: you can redistribute it and/or modify it under the
  * terms of the GNU Lesser General Public License as published by the Free Software
@@ -15,16 +15,12 @@
  */
 package org.oscim.scalebar;
 
-public final class MetricUnitAdapter implements DistanceUnitAdapter {
+public class MetricUnitAdapter implements DistanceUnitAdapter {
     public static final MetricUnitAdapter INSTANCE = new MetricUnitAdapter();
-    private static final int ONE_KILOMETER = 1000;
-    private static final int[] SCALE_BAR_VALUES = {10000000, 5000000, 2000000, 1000000, 500000, 200000, 100000, 50000,
+    public static final int ONE_KILOMETER = 1000;
+    public static final int[] SCALE_BAR_VALUES = {10000000, 5000000, 2000000, 1000000, 500000, 200000, 100000, 50000,
             20000, 10000, 5000, 2000, 1000, 500, 200, 100, 50, 20, 10, 5, 2, 1};
 
-    private MetricUnitAdapter() {
-        // do nothing
-    }
-
     @Override
     public double getMeterRatio() {
         return 1;
diff --git a/vtm/src/org/oscim/scalebar/NauticalUnitAdapter.java b/vtm/src/org/oscim/scalebar/NauticalUnitAdapter.java
index f5db1e3d..2d845b26 100644
--- a/vtm/src/org/oscim/scalebar/NauticalUnitAdapter.java
+++ b/vtm/src/org/oscim/scalebar/NauticalUnitAdapter.java
@@ -1,6 +1,6 @@
 /*
  * Copyright 2014 Christian Pesch
- * Copyright 2014-2016 devemux86
+ * Copyright 2014-2019 devemux86
  *
  * This program is free software: you can redistribute it and/or modify it under the
  * terms of the GNU Lesser General Public License as published by the Free Software
@@ -15,16 +15,12 @@
  */
 package org.oscim.scalebar;
 
-public final class NauticalUnitAdapter implements DistanceUnitAdapter {
+public class NauticalUnitAdapter implements DistanceUnitAdapter {
     public static final NauticalUnitAdapter INSTANCE = new NauticalUnitAdapter();
-    private static final int ONE_MILE = 1852;
-    private static final int[] SCALE_BAR_VALUES = {9260000, 3704000, 1852000, 926000, 370400, 185200, 92600,
+    public static final int ONE_MILE = 1852;
+    public static final int[] SCALE_BAR_VALUES = {9260000, 3704000, 1852000, 926000, 370400, 185200, 92600,
             37040, 18520, 9260, 3704, 1852, 926, 500, 200, 100, 50, 20, 10, 5, 2, 1};
 
-    private NauticalUnitAdapter() {
-        // do nothing
-    }
-
     @Override
     public double getMeterRatio() {
         return 1;