Index: firmware/App/Monitors/Conductivity.h
===================================================================
diff -u -rb04db69f541f245e543df343257bcbdb73fbbc3d -r3b64586791accd0b9e8d8978b40e2509bb86dfbe
--- firmware/App/Monitors/Conductivity.h	(.../Conductivity.h)	(revision b04db69f541f245e543df343257bcbdb73fbbc3d)
+++ firmware/App/Monitors/Conductivity.h	(.../Conductivity.h)	(revision 3b64586791accd0b9e8d8978b40e2509bb86dfbe)
@@ -8,7 +8,7 @@
 * @file    Conductivity.h
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      12-Mar-2026
+* @date    (last)      04-Jun-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  13-Sep-2024
@@ -41,29 +41,48 @@
 /// Conductivity data struct.
 typedef struct
 {
-    F32 d17Cond;                                              ///< CD1 conductivity sensor value
-    F32 d27Cond;                                              ///< CD2 conductivity sensor value
-    F32 d29Cond;                                              ///< CD3 conductivity sensor value
-    F32 d43Cond;                                              ///< CD4 conductivity sensor value
-    F32 d74Cond;                                              ///< CD5 conductivity sensor value
+    F32 d17Cond;                                            ///< D17 conductivity sensor value
+    F32 d27Cond;                                            ///< D27 conductivity sensor value
+    F32 d29Cond;                                            ///< D29 conductivity sensor value
+    F32 d43Cond;                                            ///< D43 conductivity sensor value
+    F32 d74Cond;                                            ///< D74 conductivity sensor value
 } DD_CONDUCTIVITY_DATA_T;
 
 /// Conductivity data struct.
 typedef struct
 {
-    F32 p9Conductivity;                                       ///< (P9) conductivity sensor value
-    F32 p18Conductivity;                                      ///< (P18) conductivity sensor value
+    F32 p9Conductivity;                                     ///< P9 conductivity sensor value
+    F32 p18Conductivity;                                    ///< P18 conductivity sensor value
 } FP_CONDUCTIVITY_DATA_T;
 
 /// RO rejection ratio data struct.
 typedef struct
 {
-    F32 rawRORejectionRatio;                                 ///< RO rejection ratio during tank full and fill state
-    F32 rawRORejectionRatioTankFill;                         ///< RO rejection ratio during tank fill state
-    F32 avgRORejectionRatio;                                 ///< RO rejection ratio average during tank full and fill state
-    F32 avgRORejectionRatioTankFill;                         ///< RO rejection ratio average during tank fill state
-    U32 genPermeateState;                                    ///< Permeate tank state
+    F32 rawRORejectionRatio;                                ///< RO rejection ratio during tank full and fill state
+    F32 rawRORejectionRatioTankFill;                        ///< RO rejection ratio during tank fill state
+    F32 avgRORejectionRatio;                                ///< RO rejection ratio average during tank full and fill state
+    F32 avgRORejectionRatioTankFill;                        ///< RO rejection ratio average during tank fill state
+    U32 genPermeateState;                                   ///< Permeate tank state
 } RO_REJECTION_RATIO_DATA_T;
+
+typedef struct
+{
+    F32 d17CondResist;                                      ///< D17 raw resistance value from conductivity
+    F32 d27CondResist;                                      ///< D27 raw resistance value from conductivity
+    F32 d29CondResist;                                      ///< D29 raw resistance value from conductivity
+    F32 d43CondResist;                                      ///< D43 raw resistance value from conductivity
+    F32 d74CondResist;                                      ///< D74 raw resistance value from conductivity
+    F32 p9CondResist;                                       ///< P9 raw resistance value from conductivity
+    F32 p18CondResist;                                      ///< P18 raw resistance value from conductivity
+    F32 d17RTDResist;                                       ///< D17 raw resistance value from RTD
+    F32 d27RTDResist;                                       ///< D27 raw resistance value from RTD
+    F32 d29RTDResist;                                       ///< D29 raw resistance value from RTD
+    F32 d43RTDResist;                                       ///< D43 raw resistance value from RTD
+    F32 d74RTDResist;                                       ///< D74 raw resistance value from RTD
+    F32 p9RTDResist;                                        ///< P9 raw resistance value from RTD
+    F32 p18RTDResist;                                       ///< P18 raw resistance value from RTD
+} CONDUCTIVITY_RESISTANCE_DATA_T;
+
 #pragma pack(pop)
 
 // ********** public function prototypes **********