Index: firmware/App/Controllers/ConductivitySensors.c
===================================================================
diff -u -r9438614daab0edede947e39a9d563fce8f66225e -r251ce5770cf12f583b035893d2085f8899d760be
--- firmware/App/Controllers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision 9438614daab0edede947e39a9d563fce8f66225e)
+++ firmware/App/Controllers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision 251ce5770cf12f583b035893d2085f8899d760be)
@@ -298,10 +298,10 @@
  *************************************************************************/
 static F32 calcCompensatedConductivity( F32 conductivity, F32 temperature )
 {
-    // EC = EC_25 * (1 + temp_coef * ( 25 - temperature ))
-    F32 const compensatedCoef  = ( 1.0 + ( COND_SENSOR_TEMPERATURE_COEF * ( COND_SENSOR_REFERENCE_TEMPERATURE - temperature ) ) );
+    // EC = EC_25 * (1 + temp_coef * ( temperature - 25 ))
+    F32 const compensatedCoef  = ( 1.0 + ( COND_SENSOR_TEMPERATURE_COEF * ( temperature - COND_SENSOR_REFERENCE_TEMPERATURE ) ) );
 
-    return conductivity * compensatedCoef;
+    return conductivity / compensatedCoef;
 }
 
 /*********************************************************************//**