diff -r 9166c0b82ada -r 5fbe71d69fe5 src/EditProductExport.cpp
--- a/src/EditProductExport.cpp	Mon Mar 04 19:51:57 2024 +0100
+++ b/src/EditProductExport.cpp	Tue Mar 05 10:25:15 2024 +0100
@@ -312,6 +312,13 @@
     dup->divide_factor = 1;
     dup->log_brew = dup->log_fermentation = dup->log_ispindel = dup->log_co2pressure = dup->locked = 0;
     dup->prop_volume[0] = dup->prop_volume[1] = dup->prop_volume[2] = dup->prop_volume[3] = 0;
+    /*
+     * Reset measurement fields.
+     */
+    for (int i = 0; i < dup->mashs.size(); i++) {
+        dup->mashs[i].step_ph = 0;
+        dup->mashs[i].step_sg = 0;
+    }
 
     qDebug() << dup->record << dup->name;
     if (DB_product::save(dup, this)) {