diff --git a/homeassistant/components/thermobeacon/sensor.py b/homeassistant/components/thermobeacon/sensor.py
index 6db5ff2a554..c6fb978923e 100644
--- a/homeassistant/components/thermobeacon/sensor.py
+++ b/homeassistant/components/thermobeacon/sensor.py
@@ -76,6 +76,8 @@ SENSOR_DESCRIPTIONS = {
         device_class=SensorDeviceClass.VOLTAGE,
         native_unit_of_measurement=UnitOfElectricPotential.VOLT,
         state_class=SensorStateClass.MEASUREMENT,
+        entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
     ),
 }
 
diff --git a/tests/components/thermobeacon/test_sensor.py b/tests/components/thermobeacon/test_sensor.py
index 788426f605a..e8d77e3a487 100644
--- a/tests/components/thermobeacon/test_sensor.py
+++ b/tests/components/thermobeacon/test_sensor.py
@@ -24,7 +24,7 @@ async def test_sensors(hass: HomeAssistant) -> None:
     assert len(hass.states.async_all("sensor")) == 0
     inject_bluetooth_service_info(hass, THERMOBEACON_SERVICE_INFO)
     await hass.async_block_till_done()
-    assert len(hass.states.async_all("sensor")) == 4
+    assert len(hass.states.async_all("sensor")) == 3
 
     humid_sensor = hass.states.get("sensor.lanyard_mini_hygrometer_eeff_humidity")
     humid_sensor_attrs = humid_sensor.attributes