diff --git a/config.yaml b/config.yaml
index 3640027..cb6d928 100644
--- a/config.yaml
+++ b/config.yaml
@@ -39,6 +39,17 @@ devices:
         type: "bool"
         HA_device_class: "connectivity"
         HA_platform: "binary_sensor"
+
+      # Example of a temperature sensor that returns the value in millidegrees.
+      # The 'operation' key allows performing a simple calculation.
+      # The placeholder 'value' will be replaced by the SNMP value.
+      # - name: "temperature"
+      #   oid: ".1.3.6.1.4.1.XXXX.1.1.1.5.1.3.1" # Example OID
+      #   type: "int"
+      #   operation: "value / 1000"
+      #   HA_device_class: "temperature"
+      #   HA_platform: "sensor"
+      #   HA_unit: "°C"
       
 # OID Configuration Reference:
 # - name: Unique identifier for this metric (used in MQTT topics and Home Assistant)
diff --git a/snmp2mqtt.py b/snmp2mqtt.py
index 2e81496..dec1247 100755
--- a/snmp2mqtt.py
+++ b/snmp2mqtt.py
@@ -207,6 +207,46 @@ def publish(topic, client, data, retain, qos):
         logging.error(f"Failed to send message to topic {topic}")
 
 
+def apply_operation(value, operation_str):
+    """
+    Applies a simple mathematical operation to a value.
+    e.g., operation_str = "value / 1000"
+    """
+    if 'value' not in operation_str:
+        logging.error(f"Invalid operation string: 'value' placeholder missing in '{operation_str}'")
+        return value
+
+    expression = operation_str.replace('value', str(value))
+    
+    try:
+        parts = expression.split()
+        if len(parts) != 3:
+            logging.error(f"Invalid operation format: '{operation_str}'. Expected 'value <operator> <operand>'")
+            return value
+
+        val = float(parts[0])
+        operator = parts[1]
+        operand = float(parts[2])
+
+        if operator == '+':
+            return val + operand
+        elif operator == '-':
+            return val - operand
+        elif operator == '*':
+            return val * operand
+        elif operator == '/':
+            if operand == 0:
+                logging.warning(f"Attempted division by zero in operation: {operation_str}")
+                return value
+            return val / operand
+        else:
+            logging.error(f"Unsupported operator: '{operator}' in '{operation_str}'")
+            return value
+    except (ValueError, IndexError) as e:
+        logging.error(f"Could not parse operation string: '{operation_str}'. Error: {e}")
+        return value
+
+
 async def get_snmp(req):
     """Asynchronously retrieve SNMP data from device using new pysnmp API"""
     data = {}
@@ -239,13 +279,21 @@ async def get_snmp(req):
             else:
                 for varBind in varBinds:
                     logging.debug(f"{req['device_name']} {oid['name']} => {oid['type'](varBind[1])}")
+                    
+                    # Cast to the right type
+                    value = oid['type'](varBind[1])
+                    
+                    # Apply operation if defined
+                    if 'operation' in oid:
+                        value = apply_operation(value, oid['operation'])
+
                     if oid['type'] == bool:
-                        if bool(varBind[1]):
+                        if bool(value):
                             data.update({oid["name"]: "ON"})
                         else:
                             data.update({oid["name"]: "OFF"})
                     else:
-                        data.update({oid["name"]: oid["type"](varBind[1])})
+                        data.update({oid["name"]: value})
         except Exception as e:
             logging.error(f"{req['device_name']} Exception getting OID {oid['oid']}: {e}")
             continue