diff --git a/src/pqnstack/pqn/drivers/thorlabs_polarimeter.py b/src/pqnstack/pqn/drivers/thorlabs_polarimeter.py
new file mode 100644
index 0000000..a1b57a6
--- /dev/null
+++ b/src/pqnstack/pqn/drivers/thorlabs_polarimeter.py
@@ -0,0 +1,275 @@
+from __future__ import annotations
+
+import atexit
+import contextlib
+import logging
+import time
+from dataclasses import dataclass
+from dataclasses import field
+from typing import Any
+
+import pyvisa
+from pyvisa.errors import Error as VisaError
+
+from pqnstack.base.errors import DeviceNotStartedError
+from pqnstack.base.instrument import Instrument
+from pqnstack.base.instrument import InstrumentInfo
+from pqnstack.base.instrument import log_operation
+from pqnstack.base.instrument import log_parameter
+
+logger = logging.getLogger(__name__)
+
+USB_FILTER = "USB?*::INSTR"
+CMD_ENABLE_CALC = "SENS:CALC 1"
+CMD_ENABLE_ROTATION = "INP:ROT:STAT 1"
+CMD_DISABLE_CALC = "SENS:CALC 0"
+CMD_DISABLE_ROTATION = "INP:ROT:STAT 0"
+CMD_SET_WAVELENGTH_METERS = "SENS:CORR:WAV"
+QRY_IS_CALC_ENABLED = "SENS:CALC?"
+QRY_IS_ROTATION_ENABLED = "INP:ROT:STAT?"
+QRY_WAVELENGTH_METERS = "SENS:CORR:WAV?"
+QRY_LATEST = "SENS:DATA:LAT?"
+QRY_IDN = "*IDN?"
+
+
+@dataclass(frozen=True, slots=True)
+class PAX1000IR2Info(InstrumentInfo):
+    wavelength_nm: float = float("nan")
+    last_theta_deg: float = float("nan")
+    last_eta_deg: float = float("nan")
+    last_dop: float = float("nan")
+    last_power_w: float = float("nan")
+    logging_rows: int = 0
+
+
+@dataclass(slots=True)
+class PAX1000IR2(Instrument):
+    name: str
+    desc: str
+    hw_address: str
+    parameters: set[str] = field(default_factory=set)
+    operations: dict[str, Any] = field(default_factory=dict)
+
+    pax_id_contains: str | None = None
+    pax_idn_contains: str = "PAX1000"
+
+    _rm: Any | None = field(default=None, init=False, repr=False)
+    _instr: Any | None = field(default=None, init=False, repr=False)
+    _timeout_ms: int = field(default=3000, init=False, repr=False)
+
+    _wavelength_nm_cache: float = field(default=float("nan"), init=False)
+    _last_theta_deg: float = field(default=float("nan"), init=False)
+    _last_eta_deg: float = field(default=float("nan"), init=False)
+    _last_dop: float = field(default=float("nan"), init=False)
+    _last_power_w: float = field(default=float("nan"), init=False)
+
+    def _write(self, cmd: str) -> None:
+        if self._instr is None:
+            msg = "Start the device first."
+            raise DeviceNotStartedError(msg)
+        try:
+            self._instr.write(f"{cmd}\n")
+        except (VisaError, OSError):
+            with contextlib.suppress(VisaError, OSError):
+                self._instr.write(cmd)
+
+    def _query(self, cmd: str) -> str:
+        if self._instr is None:
+            msg = "Start the device first."
+            raise DeviceNotStartedError(msg)
+        try:
+            self._instr.write(f"{cmd}\n")
+            return str(self._instr.read()).strip()
+        except (VisaError, OSError):
+            try:
+                return str(self._instr.query(cmd)).strip()
+            except (VisaError, OSError):
+                return ""
+
+    def _list_usb_resources(self) -> tuple[str, ...]:
+        assert self._rm is not None
+        try:
+            return self._rm.list_resources(USB_FILTER)  # type: ignore[no-any-return]
+        except VisaError as exc:
+            msg = f"VISA resource discovery failed: {exc}"
+            raise FileNotFoundError(msg) from exc
+
+    def _filter_candidates(self, resources: tuple[str, ...]) -> tuple[str, ...]:
+        if self.pax_id_contains:
+            return tuple(r for r in resources if self.pax_id_contains in r)
+        return resources
+
+    def _probe_idn(self, resource_name: str) -> str:
+        assert self._rm is not None
+        try:
+            with self._rm.open_resource(resource_name) as resource_handle:
+                visa_resource: Any = resource_handle
+                visa_resource.timeout = self._timeout_ms
+                try:
+                    visa_resource.write(f"{QRY_IDN}\n")
+                    return str(visa_resource.read()).strip()
+                except (VisaError, OSError):
+                    try:
+                        return str(visa_resource.query(QRY_IDN)).strip()
+                    except (VisaError, OSError):
+                        return ""
+        except VisaError as exc:
+            logger.debug("Resource probe failed for %s: %s", resource_name, exc)
+            return ""
+
+    def _discover_resource(self) -> str:
+        resources = self._filter_candidates(self._list_usb_resources())
+        if not resources:
+            msg = "No USB VISA resources matched filter."
+            raise FileNotFoundError(msg)
+        if len(resources) == 1 and not self.pax_idn_contains:
+            return resources[0]
+        idn_substring = self.pax_idn_contains or ""
+        matched = [r for r in resources if (not idn_substring) or (idn_substring in self._probe_idn(r))]
+        if len(matched) != 1:
+            msg = "PAX discovery ambiguous or no match."
+            raise FileNotFoundError(msg)
+        return matched[0]
+
+    def _open_resource(self, resource_name: str) -> None:
+        assert self._rm is not None
+        try:
+            self._instr = self._rm.open_resource(resource_name)
+            self._instr.timeout = self._timeout_ms
+        except VisaError as exc:
+            self._instr = None
+            msg = f"Failed to open VISA resource {resource_name}: {exc}"
+            raise RuntimeError(msg) from exc
+
+    def _write_and_confirm(self, set_cmd: str, qry_cmd: str, expect: str | float) -> bool:
+        try:
+            self._write(set_cmd)
+        except DeviceNotStartedError:
+            return False
+        expected_prefix = str(expect)
+        for _ in range(10):
+            try:
+                last_response = self._query(qry_cmd)
+            except DeviceNotStartedError:
+                last_response = ""
+            if last_response.startswith(expected_prefix):
+                return True
+            time.sleep(0.05)
+        return False
+
+    def _init_settings(self) -> None:
+        calc_ok = self._write_and_confirm(CMD_ENABLE_CALC, QRY_IS_CALC_ENABLED, 1)
+        rot_ok = self._write_and_confirm(CMD_ENABLE_ROTATION, QRY_IS_ROTATION_ENABLED, 1)
+        if not (calc_ok and rot_ok):
+            with contextlib.suppress(Exception):
+                self._write_and_confirm(CMD_DISABLE_CALC, QRY_IS_CALC_ENABLED, 0)
+                self._write_and_confirm(CMD_DISABLE_ROTATION, QRY_IS_ROTATION_ENABLED, 0)
+            msg = "PAX setup failed to enable calc/rotation."
+            raise RuntimeError(msg)
+
+    def _read_wavelength_cache(self) -> None:
+        try:
+            raw_value = self._query(QRY_WAVELENGTH_METERS)
+            self._wavelength_nm_cache = float(raw_value) * 1e9
+        except (ValueError, TypeError):
+            self._wavelength_nm_cache = float("nan")
+
+    @log_operation
+    def set_wavelength_nm(self, wavelength_nm: float) -> None:
+        try:
+            value_m = float(wavelength_nm) * 1e-9
+        except (TypeError, ValueError) as exc:
+            msg = f"Invalid wavelength: {wavelength_nm}"
+            raise ValueError(msg) from exc
+        self._write(f"{CMD_SET_WAVELENGTH_METERS} {value_m}")
+        self._read_wavelength_cache()
+
+    def start(self) -> None:
+        if self._instr is not None:
+            return
+        try:
+            self._rm = pyvisa.ResourceManager("@py")
+        except Exception as exc:
+            msg = f"VISA backend not available: {exc}"
+            raise RuntimeError(msg) from exc
+
+        resource_name = self.hw_address or self._discover_resource()
+        self._open_resource(resource_name)
+        self._init_settings()
+        self._read_wavelength_cache()
+
+        self.operations.update(
+            {
+                "read": self.read,
+                "set_wavelength_nm": self.set_wavelength_nm,
+            }
+        )
+        atexit.register(self.close)
+
+    def close(self) -> None:
+        if self._instr is not None:
+            with contextlib.suppress(Exception):
+                self._write(CMD_DISABLE_CALC)
+                self._write(CMD_DISABLE_ROTATION)
+                _ = self._query(QRY_IS_CALC_ENABLED)
+                _ = self._query(QRY_IS_ROTATION_ENABLED)
+            with contextlib.suppress(Exception):
+                self._instr.close()
+            self._instr = None
+        if self._rm is not None:
+            with contextlib.suppress(Exception):
+                self._rm.close()
+            self._rm = None
+
+    @property
+    def info(self) -> PAX1000IR2Info:
+        return PAX1000IR2Info(
+            name=self.name,
+            desc=self.desc,
+            hw_address=self.hw_address,
+            hw_status={"connected": self._instr is not None},
+            wavelength_nm=self._wavelength_nm_cache,
+            last_theta_deg=self._last_theta_deg,
+            last_eta_deg=self._last_eta_deg,
+            last_dop=self._last_dop,
+            last_power_w=self._last_power_w,
+        )
+
+    @property
+    @log_parameter
+    def wavelength_nm(self) -> float:
+        return self._wavelength_nm_cache
+
+    @log_operation
+    def read(self) -> dict[str, float]:
+        if self._instr is None:
+            msg = "Start the device first."
+            raise DeviceNotStartedError(msg)
+        raw_reply = self._query(QRY_LATEST)
+        token_strs = [p for p in raw_reply.replace(";", ",").split(",") if p]
+        parsed_values: list[float | str] = []
+        for token_str in token_strs:
+            try:
+                parsed_values.append(float(token_str))
+            except (ValueError, TypeError):
+                parsed_values.append(token_str)
+
+        def get_float_at(index: int) -> float:
+            try:
+                value = parsed_values[index]
+                return float(value) if isinstance(value, (float, int)) else float(str(value))
+            except (ValueError, TypeError, IndexError):
+                return float("nan")
+
+        self._last_theta_deg = get_float_at(9)
+        self._last_eta_deg = get_float_at(10)
+        self._last_dop = get_float_at(11)
+        self._last_power_w = get_float_at(12)
+
+        return {
+            "pax_theta_deg": self._last_theta_deg,
+            "pax_eta_deg": self._last_eta_deg,
+            "pax_dop": self._last_dop,
+            "pax_power_w": self._last_power_w,
+            "pax_wavelength_nm": self._wavelength_nm_cache,
+        }
diff --git a/test.py b/test.py
new file mode 100644
index 0000000..28f5358
--- /dev/null
+++ b/test.py
@@ -0,0 +1,9 @@
+from time import sleep
+
+from pqnstack.pqn.drivers.powermeter import PM100DDevice
+
+powermeter = PM100DDevice(name="bob", desc="desk", address="/dev/usbtmc0")
+powermeter.start()
+sleep(5)
+while True:
+    sleep(0.5)