diff --git a/src/test/java/org/djunits/unit/DimensionlessUnitTest.java b/src/test/java/org/djunits/unit/DimensionlessUnitTest.java
index 8989b76..4a555ac 100644
--- a/src/test/java/org/djunits/unit/DimensionlessUnitTest.java
+++ b/src/test/java/org/djunits/unit/DimensionlessUnitTest.java
@@ -33,7 +33,7 @@ public final void setup()
     @Test
     public final void conversions()
     {
-        assertEquals("1", DimensionlessUnit.SI.getQuantity().getSiDimensions().toString(true, false));
+        assertEquals("", DimensionlessUnit.SI.getQuantity().getSiDimensions().toString(true, false));
         checkUnitRatioNameAndAbbreviation(DimensionlessUnit.SI, 1, 0.000001, "", "");
     }
 
diff --git a/src/test/java/org/djunits/value/vdouble/scalar/DoubleValueOfTest.java b/src/test/java/org/djunits/value/vdouble/scalar/DoubleValueOfTest.java
index cd47466..66c205e 100644
--- a/src/test/java/org/djunits/value/vdouble/scalar/DoubleValueOfTest.java
+++ b/src/test/java/org/djunits/value/vdouble/scalar/DoubleValueOfTest.java
@@ -130,10 +130,12 @@ public void testSIScalar() throws UnitException
         // test if the . in 10.0 is not removed...
         assertEquals(SIScalar.instantiateSI(10.0, m2), SIScalar.valueOf("10.0 m^2"));
 
+        legal(SIScalar.class, 10.0, "");
+        assertEquals(SIScalar.instantiateSI(10.0, SIUnit.DIMLESS), SIScalar.valueOf("10.0"));
+
         legal(SIScalar.class, 10.0, "m2");
         legal(SIScalar.class, "10.0 m2");
         illegal(SIScalar.class, 10.0, null);
-        illegal(SIScalar.class, 10.0, "");
         illegal(SIScalar.class, null);
         illegal(SIScalar.class, "");
         // illegal(SIScalar.class, "1.0.0 m2"); // formatter.parse() does not use the whole number string
diff --git a/src/test/java/org/djunits/value/vdouble/vector/DoubleVectorMethodTest.java b/src/test/java/org/djunits/value/vdouble/vector/DoubleVectorMethodTest.java
index 06a493c..90362ac 100644
--- a/src/test/java/org/djunits/value/vdouble/vector/DoubleVectorMethodTest.java
+++ b/src/test/java/org/djunits/value/vdouble/vector/DoubleVectorMethodTest.java
@@ -291,7 +291,7 @@ public void testVectorMethods() throws ValueRuntimeException, UnitException
                         SIVector amDiv = am.divide(am2);
                         assertEquals("unit of m2 * m2 should be m4", "m4",
                                 amTim.getDisplayUnit().getQuantity().getSiDimensions().toString(false, false, false));
-                        assertEquals("unit of m2 / m2 should be 1", "1",
+                        assertEquals("unit of m2 / m2 should be empty string", "",
                                 amDiv.getDisplayUnit().getQuantity().getSiDimensions().toString(false, false, false));
                         for (int index = 0; index < testData.length; index++)
                         {
diff --git a/src/test/java/org/djunits/value/vfloat/matrix/FloatMatrixMethodTest.java b/src/test/java/org/djunits/value/vfloat/matrix/FloatMatrixMethodTest.java
index 7ddc2ca..482369b 100644
--- a/src/test/java/org/djunits/value/vfloat/matrix/FloatMatrixMethodTest.java
+++ b/src/test/java/org/djunits/value/vfloat/matrix/FloatMatrixMethodTest.java
@@ -417,7 +417,7 @@ public void testMatrixMethods() throws ValueRuntimeException, UnitException
                         FloatSIMatrix amDiv = am.divide(am2);
                         assertEquals("unit of m2 * m2 should be m4", "m4",
                                 amTim.getDisplayUnit().getQuantity().getSiDimensions().toString(false, false, false));
-                        assertEquals("unit of m2 / m2 should be 1", "1",
+                        assertEquals("unit of m2 / m2 should be empty string", "",
                                 amDiv.getDisplayUnit().getQuantity().getSiDimensions().toString(false, false, false));
                         for (int row = 0; row < testData.length; row++)
                         {
diff --git a/src/test/java/org/djunits/value/vfloat/scalar/FloatValueOfTest.java b/src/test/java/org/djunits/value/vfloat/scalar/FloatValueOfTest.java
index 3662bdc..5c95a91 100644
--- a/src/test/java/org/djunits/value/vfloat/scalar/FloatValueOfTest.java
+++ b/src/test/java/org/djunits/value/vfloat/scalar/FloatValueOfTest.java
@@ -30,8 +30,7 @@ public class FloatValueOfTest
      * @param value the value to enter
      * @param unitString the unit String to use
      */
-    private void legal(final Class<? extends FloatScalar<?, ?>> scalarClass, final float value,
-            final String unitString)
+    private void legal(final Class<? extends FloatScalar<?, ?>> scalarClass, final float value, final String unitString)
     {
         try
         {
@@ -68,8 +67,7 @@ private void legal(final Class<? extends FloatScalar<?, ?>> scalarClass, final S
      * @param value the value to enter
      * @param unitString the unit String to use
      */
-    private void illegal(final Class<? extends FloatScalar<?, ?>> scalarClass, final float value,
-            final String unitString)
+    private void illegal(final Class<? extends FloatScalar<?, ?>> scalarClass, final float value, final String unitString)
     {
         try
         {
@@ -125,10 +123,12 @@ public void testFloatSIScalar() throws UnitException
         // test if the . in 10.0 is not removed...
         assertEquals(FloatSIScalar.instantiateSI(10.0f, m2), FloatSIScalar.valueOf("10.0 m^2"));
 
+        legal(FloatSIScalar.class, 10.0f, "");
+        assertEquals(FloatSIScalar.instantiateSI(10.0f, SIUnit.DIMLESS), FloatSIScalar.valueOf("10.0"));
+
         legal(FloatSIScalar.class, 10.0f, "m2");
         legal(FloatSIScalar.class, "10.0 m2");
         illegal(FloatSIScalar.class, 10.0f, null);
-        illegal(FloatSIScalar.class, 10.0f, "");
         illegal(FloatSIScalar.class, null);
         illegal(FloatSIScalar.class, "");
         // illegal(FloatSIScalar.class, "1.0.0 m2"); // formatter.pasrse() does not use the whole number string
@@ -143,7 +143,7 @@ public void testFloatSIScalar() throws UnitException
         {
             // Ignore expected exception
         }
-        
+
         try
         {
             FloatSIScalar.valueOf("xyzuvw");
diff --git a/src/test/java/org/djunits/value/vfloat/vector/FloatVectorMethodTest.java b/src/test/java/org/djunits/value/vfloat/vector/FloatVectorMethodTest.java
index bc2c405..5fc0df8 100644
--- a/src/test/java/org/djunits/value/vfloat/vector/FloatVectorMethodTest.java
+++ b/src/test/java/org/djunits/value/vfloat/vector/FloatVectorMethodTest.java
@@ -291,7 +291,7 @@ public void testVectorMethods() throws ValueRuntimeException, UnitException
                         FloatSIVector amDiv = am.divide(am2);
                         assertEquals("unit of m2 * m2 should be m4", "m4",
                                 amTim.getDisplayUnit().getQuantity().getSiDimensions().toString(false, false, false));
-                        assertEquals("unit of m2 / m2 should be 1", "1",
+                        assertEquals("unit of m2 / m2 should be empty string", "",
                                 amDiv.getDisplayUnit().getQuantity().getSiDimensions().toString(false, false, false));
                         for (int index = 0; index < testData.length; index++)
                         {