diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/BMIMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/BMIMeasurementView.java
index b37de99c..fd7d9ff4 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/BMIMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/BMIMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class BMIMeasurementView extends FloatMeasurementView {
+    public static String KEY = "bmi";
 
     public BMIMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_bmi), ContextCompat.getDrawable(context, R.drawable.ic_bmi));
@@ -33,7 +34,7 @@ public class BMIMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "bmi";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/BMRMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/BMRMeasurementView.java
index 8845c832..2c34f5ee 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/BMRMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/BMRMeasurementView.java
@@ -28,6 +28,7 @@ import com.health.openscale.core.evaluation.EvaluationSheet;
 import java.util.Locale;
 
 public class BMRMeasurementView extends FloatMeasurementView {
+    public static String KEY = "bmr";
 
     public BMRMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_bmr), ContextCompat.getDrawable(context, R.drawable.ic_bmr));
@@ -35,7 +36,7 @@ public class BMRMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "bmr";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/BoneMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/BoneMeasurementView.java
index 24d52744..80809105 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/BoneMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/BoneMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class BoneMeasurementView extends FloatMeasurementView {
+    public static String KEY = "bone";
 
     public BoneMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_bone), ContextCompat.getDrawable(context, R.drawable.ic_bone));
@@ -33,7 +34,7 @@ public class BoneMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "bone";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/CommentMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/CommentMeasurementView.java
index c02ffd76..8946506d 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/CommentMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/CommentMeasurementView.java
@@ -27,6 +27,8 @@ import com.health.openscale.R;
 import com.health.openscale.core.datatypes.ScaleMeasurement;
 
 public class CommentMeasurementView extends MeasurementView {
+    public static String KEY = "comment";
+
     private String comment;
 
     public CommentMeasurementView(Context context) {
@@ -35,7 +37,7 @@ public class CommentMeasurementView extends MeasurementView {
 
     @Override
     public String getKey() {
-        return "comment";
+        return KEY;
     }
 
     private void setValue(String newComment, boolean callListener) {
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/DateMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/DateMeasurementView.java
index 1a32226a..1cffed7c 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/DateMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/DateMeasurementView.java
@@ -30,6 +30,8 @@ import java.util.Calendar;
 import java.util.Date;
 
 public class DateMeasurementView extends MeasurementView {
+    public static String KEY = "date";
+
     private static DateFormat dateFormat = DateFormat.getDateInstance();
     private Date date;
 
@@ -39,10 +41,9 @@ public class DateMeasurementView extends MeasurementView {
 
     @Override
     public String getKey() {
-        return "date";
+        return KEY;
     }
 
-
     private void setValue(Date newDate, boolean callListener) {
         if (!newDate.equals(date)) {
             date = newDate;
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/FatMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/FatMeasurementView.java
index 3e1d933b..ca00b91c 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/FatMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/FatMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class FatMeasurementView extends FloatMeasurementView {
+    public static String KEY = "fat";
 
     private boolean estimateFatEnable;
     private boolean percentageEnable;
@@ -36,7 +37,7 @@ public class FatMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "fat";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/HipMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/HipMeasurementView.java
index b2bf2263..f1a59022 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/HipMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/HipMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class HipMeasurementView extends FloatMeasurementView {
+    public static String KEY = "hip";
 
     public HipMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_hip), ContextCompat.getDrawable(context, R.drawable.ic_hip));
@@ -33,7 +34,7 @@ public class HipMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "hip";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/LBWMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/LBWMeasurementView.java
index 25eeda0e..40dd91c9 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/LBWMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/LBWMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class LBWMeasurementView extends FloatMeasurementView {
+    public static String KEY = "lbw";
 
     private boolean estimateLBWEnable;
 
@@ -35,7 +36,7 @@ public class LBWMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "lbw";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/MuscleMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/MuscleMeasurementView.java
index b18f47fa..0965c8c5 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/MuscleMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/MuscleMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class MuscleMeasurementView extends FloatMeasurementView {
+    public static String KEY = "muscle";
 
     private boolean percentageEnable;
 
@@ -35,7 +36,7 @@ public class MuscleMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "muscle";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/TimeMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/TimeMeasurementView.java
index bc59c518..7fec2dbb 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/TimeMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/TimeMeasurementView.java
@@ -30,6 +30,8 @@ import java.util.Calendar;
 import java.util.Date;
 
 public class TimeMeasurementView extends MeasurementView {
+    public static String KEY = "time";
+
     private DateFormat timeFormat;
     private Date time;
 
@@ -40,7 +42,7 @@ public class TimeMeasurementView extends MeasurementView {
 
     @Override
     public String getKey() {
-        return "time";
+        return KEY;
     }
 
     private void setValue(Date newTime, boolean callListener) {
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/WHRMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/WHRMeasurementView.java
index 5cdcb904..18da9f8c 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/WHRMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/WHRMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class WHRMeasurementView extends FloatMeasurementView {
+    public static String KEY = "whr";
 
     public WHRMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_whr), ContextCompat.getDrawable(context, R.drawable.ic_whr));
@@ -33,7 +34,7 @@ public class WHRMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "whr";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/WHtRMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/WHtRMeasurementView.java
index b60c05ac..72db9865 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/WHtRMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/WHtRMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class WHtRMeasurementView extends FloatMeasurementView {
+    public static String KEY = "whtr";
 
     public WHtRMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_whtr), ContextCompat.getDrawable(context, R.drawable.ic_whtr));
@@ -33,7 +34,7 @@ public class WHtRMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "whtr";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/WaistMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/WaistMeasurementView.java
index 9a776fb0..40a3e0fb 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/WaistMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/WaistMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class WaistMeasurementView extends FloatMeasurementView {
+    public static String KEY = "waist";
 
     public WaistMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_waist), ContextCompat.getDrawable(context, R.drawable.ic_waist));
@@ -33,7 +34,7 @@ public class WaistMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "waist";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/WaterMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/WaterMeasurementView.java
index 53f419f7..37931d15 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/WaterMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/WaterMeasurementView.java
@@ -26,6 +26,7 @@ import com.health.openscale.core.evaluation.EvaluationResult;
 import com.health.openscale.core.evaluation.EvaluationSheet;
 
 public class WaterMeasurementView extends FloatMeasurementView {
+    public static String KEY = "water";
 
     private boolean estimateWaterEnable;
     private boolean percentageEnable;
@@ -36,7 +37,7 @@ public class WaterMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "water";
+        return KEY;
     }
 
     @Override
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/WeightMeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/WeightMeasurementView.java
index b70febcb..72a53936 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/WeightMeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/WeightMeasurementView.java
@@ -27,6 +27,7 @@ import com.health.openscale.core.evaluation.EvaluationSheet;
 import com.health.openscale.core.utils.Converters;
 
 public class WeightMeasurementView extends FloatMeasurementView {
+    public static String KEY = "weight";
 
     public WeightMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_weight), ContextCompat.getDrawable(context, R.drawable.ic_weight));
@@ -34,7 +35,7 @@ public class WeightMeasurementView extends FloatMeasurementView {
 
     @Override
     public String getKey() {
-        return "weight";
+        return KEY;
     }
 
     @Override