diff --git a/homeassistant/components/iron_os/sensor.py b/homeassistant/components/iron_os/sensor.py
index 680ad9abfde..b21fa2e5591 100644
--- a/homeassistant/components/iron_os/sensor.py
+++ b/homeassistant/components/iron_os/sensor.py
@@ -107,6 +107,7 @@ PINECIL_SENSOR_DESCRIPTIONS: tuple[IronOSSensorEntityDescription, ...] = (
         native_unit_of_measurement=OHM,
         value_fn=lambda data: data.tip_resistance,
         entity_category=EntityCategory.DIAGNOSTIC,
+        state_class=SensorStateClass.MEASUREMENT,
     ),
     IronOSSensorEntityDescription(
         key=PinecilSensor.UPTIME,
diff --git a/tests/components/iron_os/snapshots/test_sensor.ambr b/tests/components/iron_os/snapshots/test_sensor.ambr
index 4149d5c9a1d..44a17dd6ea5 100644
--- a/tests/components/iron_os/snapshots/test_sensor.ambr
+++ b/tests/components/iron_os/snapshots/test_sensor.ambr
@@ -537,7 +537,9 @@
     'aliases': set({
     }),
     'area_id': None,
-    'capabilities': None,
+    'capabilities': dict({
+      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
+    }),
     'config_entry_id': <ANY>,
     'device_class': None,
     'device_id': <ANY>,
@@ -569,6 +571,7 @@
   StateSnapshot({
     'attributes': ReadOnlyDict({
       'friendly_name': 'Pinecil Tip resistance',
+      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
       'unit_of_measurement': 'Ω',
     }),
     'context': <ANY>,