Index: sources/model/mloadcellreadings.h
===================================================================
diff -u -re591b135f821c1b1e13c2db8429dc63648c2452c -r7d3062c841b788ced31d939dec990afe0de1442d
--- sources/model/mloadcellreadings.h	(.../mloadcellreadings.h)	(revision e591b135f821c1b1e13c2db8429dc63648c2452c)
+++ sources/model/mloadcellreadings.h	(.../mloadcellreadings.h)	(revision 7d3062c841b788ced31d939dec990afe0de1442d)
@@ -19,9 +19,16 @@
 // Project
 #include "types.h"
 
+// forward declarations
+class tst_models;
+
 namespace Model {
 
 class MLoadCellReadings {
+
+    // friends
+    friend class ::tst_models;
+
 public:
     QString  stringPrefix = "Load Cell Readings";
     struct Data {