diff --git a/test/towerops/snmp/profiles/base_sensors_extra_test.exs b/test/towerops/snmp/profiles/base_sensors_extra_test.exs
new file mode 100644
index 00000000..ef10713e
--- /dev/null
+++ b/test/towerops/snmp/profiles/base_sensors_extra_test.exs
@@ -0,0 +1,171 @@
+defmodule Towerops.Snmp.Profiles.BaseSensorsExtraTest do
+  @moduledoc """
+  Targets `Towerops.Snmp.Profiles.Base.discover_sensors/1` branches that map
+  ENTITY-SENSOR-MIB type/unit/scale/status codes — exercising
+  `parse_sensor_type/1`, `sensor_type_to_unit/1`, `scale_to_divisor/1`,
+  and `parse_sensor_status/1` clauses.
+  """
+
+  use Towerops.DataCase, async: true
+
+  alias Towerops.Snmp.Adapters.Replay
+  alias Towerops.Snmp.Profiles.Base
+
+  describe "discover_sensors/1 type/unit/scale/status mapping" do
+    test "discovers an amperes sensor with milli scale and ok status" do
+      client_opts = [
+        adapter: Replay,
+        oid_map: %{
+          # entPhysSensorType: 5 = amperes
+          "1.3.6.1.2.1.99.1.1.1.1.1" => "5",
+          # scale: -3 (milli)
+          "1.3.6.1.2.1.99.1.1.1.2.1" => "-3",
+          # precision: 0
+          "1.3.6.1.2.1.99.1.1.1.3.1" => "0",
+          # value
+          "1.3.6.1.2.1.99.1.1.1.4.1" => "1500",
+          # oper status: 1 = ok
+          "1.3.6.1.2.1.99.1.1.1.5.1" => "1"
+        }
+      ]
+
+      assert {:ok, [sensor]} = Base.discover_sensors(client_opts)
+      assert sensor.sensor_type == "amperes"
+      assert sensor.sensor_unit == "A"
+      assert sensor.status == "ok"
+      assert sensor.sensor_divisor == 1_000
+    end
+
+    test "discovers a watts sensor with micro scale" do
+      client_opts = [
+        adapter: Replay,
+        oid_map: %{
+          # entPhysSensorType: 6 = watts
+          "1.3.6.1.2.1.99.1.1.1.1.2" => "6",
+          # scale: -6 (micro)
+          "1.3.6.1.2.1.99.1.1.1.2.2" => "-6",
+          "1.3.6.1.2.1.99.1.1.1.3.2" => "0",
+          "1.3.6.1.2.1.99.1.1.1.4.2" => "2_500_000",
+          "1.3.6.1.2.1.99.1.1.1.5.2" => "1"
+        }
+      ]
+
+      assert {:ok, [sensor]} = Base.discover_sensors(client_opts)
+      assert sensor.sensor_type == "watts"
+      assert sensor.sensor_unit == "W"
+      assert sensor.sensor_divisor == 1_000_000
+    end
+
+    test "discovers a hertz sensor and a percent sensor with various statuses" do
+      client_opts = [
+        adapter: Replay,
+        oid_map: %{
+          # Sensor 1: hertz (type 7)
+          "1.3.6.1.2.1.99.1.1.1.1.1" => "7",
+          "1.3.6.1.2.1.99.1.1.1.2.1" => "0",
+          "1.3.6.1.2.1.99.1.1.1.3.1" => "0",
+          "1.3.6.1.2.1.99.1.1.1.4.1" => "60",
+          # status 2 = unavailable
+          "1.3.6.1.2.1.99.1.1.1.5.1" => "2",
+
+          # Sensor 2: percent (type 9)
+          "1.3.6.1.2.1.99.1.1.1.1.2" => "9",
+          "1.3.6.1.2.1.99.1.1.1.2.2" => "0",
+          "1.3.6.1.2.1.99.1.1.1.3.2" => "0",
+          "1.3.6.1.2.1.99.1.1.1.4.2" => "75",
+          # status 3 = nonoperational
+          "1.3.6.1.2.1.99.1.1.1.5.2" => "3"
+        }
+      ]
+
+      assert {:ok, sensors} = Base.discover_sensors(client_opts)
+      assert length(sensors) == 2
+
+      hz = Enum.find(sensors, &(&1.sensor_type == "hertz"))
+      assert hz.sensor_unit == "Hz"
+      assert hz.status == "unavailable"
+
+      pct = Enum.find(sensors, &(&1.sensor_type == "percent"))
+      assert pct.sensor_unit == "%"
+      assert pct.status == "nonoperational"
+    end
+
+    test "discovers rpm and cmm sensors" do
+      client_opts = [
+        adapter: Replay,
+        oid_map: %{
+          # rpm (type 10)
+          "1.3.6.1.2.1.99.1.1.1.1.1" => "10",
+          "1.3.6.1.2.1.99.1.1.1.2.1" => "0",
+          "1.3.6.1.2.1.99.1.1.1.3.1" => "0",
+          "1.3.6.1.2.1.99.1.1.1.4.1" => "3000",
+          "1.3.6.1.2.1.99.1.1.1.5.1" => "1",
+
+          # cmm (type 11)
+          "1.3.6.1.2.1.99.1.1.1.1.2" => "11",
+          "1.3.6.1.2.1.99.1.1.1.2.2" => "0",
+          "1.3.6.1.2.1.99.1.1.1.3.2" => "0",
+          "1.3.6.1.2.1.99.1.1.1.4.2" => "12",
+          "1.3.6.1.2.1.99.1.1.1.5.2" => "1"
+        }
+      ]
+
+      assert {:ok, sensors} = Base.discover_sensors(client_opts)
+      rpm = Enum.find(sensors, &(&1.sensor_type == "rpm"))
+      assert rpm.sensor_unit == "RPM"
+      cmm = Enum.find(sensors, &(&1.sensor_type == "cmm"))
+      # cmm has empty unit (sensor_type_to_unit fallthrough)
+      assert cmm.sensor_unit == ""
+    end
+
+    test "unknown sensor type and unknown status fall through to defaults" do
+      client_opts = [
+        adapter: Replay,
+        oid_map: %{
+          # type 99 - unknown
+          "1.3.6.1.2.1.99.1.1.1.1.1" => "99",
+          "1.3.6.1.2.1.99.1.1.1.2.1" => "0",
+          "1.3.6.1.2.1.99.1.1.1.3.1" => "0",
+          "1.3.6.1.2.1.99.1.1.1.4.1" => "10",
+          # status 99 - unknown
+          "1.3.6.1.2.1.99.1.1.1.5.1" => "99"
+        }
+      ]
+
+      assert {:ok, [sensor]} = Base.discover_sensors(client_opts)
+      assert sensor.sensor_type == "unknown"
+      assert sensor.sensor_unit == ""
+      assert sensor.status == "unknown"
+    end
+
+    test "uses ENTITY-MIB name when present, descr when name is empty" do
+      client_opts = [
+        adapter: Replay,
+        oid_map: %{
+          # Sensor 1 — has name
+          "1.3.6.1.2.1.99.1.1.1.1.1" => "8",
+          "1.3.6.1.2.1.99.1.1.1.2.1" => "0",
+          "1.3.6.1.2.1.99.1.1.1.3.1" => "0",
+          "1.3.6.1.2.1.99.1.1.1.4.1" => "42",
+          "1.3.6.1.2.1.99.1.1.1.5.1" => "1",
+          "1.3.6.1.2.1.47.1.1.1.1.7.1" => "Inlet Temperature",
+
+          # Sensor 2 — no name, has descr
+          "1.3.6.1.2.1.99.1.1.1.1.2" => "8",
+          "1.3.6.1.2.1.99.1.1.1.2.2" => "0",
+          "1.3.6.1.2.1.99.1.1.1.3.2" => "0",
+          "1.3.6.1.2.1.99.1.1.1.4.2" => "55",
+          "1.3.6.1.2.1.99.1.1.1.5.2" => "1",
+          "1.3.6.1.2.1.47.1.1.1.1.2.2" => "CPU thermal probe"
+        }
+      ]
+
+      assert {:ok, sensors} = Base.discover_sensors(client_opts)
+      named = Enum.find(sensors, &(&1.sensor_index == "1"))
+      assert named.sensor_descr == "Inlet Temperature"
+
+      descr_only = Enum.find(sensors, &(&1.sensor_index == "2"))
+      assert descr_only.sensor_descr == "CPU thermal probe"
+    end
+  end
+end