Index: MsgDefs.h
===================================================================
diff -u -r2de432e6f313eeb3c3d82f65a6cc0970a7f6f064 -r1f836cd584c0c3a5190b95c3460021158d21dae2
--- MsgDefs.h	(.../MsgDefs.h)	(revision 2de432e6f313eeb3c3d82f65a6cc0970a7f6f064)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 1f836cd584c0c3a5190b95c3460021158d21dae2)
@@ -8,8 +8,8 @@
 *
 * @file    MsgDefs.h
 *
-* @author  (last)      Varshini Nagabooshanam
-* @date    (last)      19-Jan-2026
+* @author  (last)      Michael Garthwaite
+* @date    (last)      27-Jan-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -353,6 +353,7 @@
     MSG_ID_DD_RINSE_PUMP_DATA_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0xA053,           ///< DD rinse pump broadcast data override request
     MSG_ID_DD_RINSE_PUMP_PWM_PERCENT_OVERRIDE_REQUEST = 0xA054,                     ///< DD rinse pump PWM percent override request
     MSG_ID_DD_RINSE_PUMP_TURN_ON_OFF_REQUEST = 0xA055,                              ///< DD rinse pump turn on/off request
+    MSG_ID_DD_SET_CONDUCTIVITY_MODEL_REQUEST = 0xA056,                              ///< DD set conductivity model to conductivity sensors ( also applies to FP conductivity sensors )
 
     MSG_ID_FIRST_FP_TESTER_MESSAGE = 0xB000,                                        ///< First FP test message ID
     MSG_ID_FP_TESTER_LOGIN_REQUEST = MSG_ID_FIRST_FP_TESTER_MESSAGE,                ///< FP tester log-in