diff --git a/examples/filters/README.md b/examples/filters/README.md
index 4d49244..64f2c96 100644
--- a/examples/filters/README.md
+++ b/examples/filters/README.md
@@ -7,6 +7,10 @@
 背景、代价与可追溯性约定见 `docs/filters.md`；延迟/噪声实测见 `_perf/` 与
 `orisys-sdk-perf-plan.md`。
 
+下面每一段都有一个同目录的机器可读副本 `filters_<预设名>.json`（四个文件），
+`tests/test_filter_presets.py` 会核对它们与 `FILTER_PRESETS` 完全一致 —— 所以改预设时
+这些文件会一起红，不会悄悄过时。
+
 ---
 
 ## `off` —— 原始读数（默认）
@@ -86,3 +90,13 @@ print(s.filters_state()["preset"], s.filters_state()["measurement"], s.filters_s
 `flow_ema_applied` / `force_median_applied` / `force_lowpass_applied` 三个布尔就是
 "这一级到底有没有在滤"的答案；`flow_ema_alpha` 属于 **measurement**（改变测量，
 不同值的两次录制不可比），中值与低通属于 **readout**（只影响读数呈现）。
+
+导出标定/写记录时把同一个状态交给指纹函数，文件里就会留下可核对的设置：
+
+```python
+from orisys.calibration import pipeline_from_sensor_json
+pipeline = pipeline_from_sensor_json("sensors/mini/sensor.json", filters_state=s.filters_state())
+print(pipeline["filters"])   # measurement / readout / preset / source
+```
+
+详见 `docs/filters.md` 第 7 节。
diff --git a/examples/filters/filters_balanced.json b/examples/filters/filters_balanced.json
new file mode 100644
index 0000000..26e834a
--- /dev/null
+++ b/examples/filters/filters_balanced.json
@@ -0,0 +1,7 @@
+{
+  "flow_ema_alpha": 0.5,
+  "force_median_window": 3,
+  "force_lowpass_cutoff_hz": 0.0,
+  "force_lowpass_order": 2,
+  "force_lowpass_sample_rate_hz": "auto"
+}
diff --git a/examples/filters/filters_low_latency.json b/examples/filters/filters_low_latency.json
new file mode 100644
index 0000000..b29795f
--- /dev/null
+++ b/examples/filters/filters_low_latency.json
@@ -0,0 +1,7 @@
+{
+  "flow_ema_alpha": 1.0,
+  "force_median_window": 3,
+  "force_lowpass_cutoff_hz": 0.0,
+  "force_lowpass_order": 2,
+  "force_lowpass_sample_rate_hz": "auto"
+}
diff --git a/examples/filters/filters_low_noise.json b/examples/filters/filters_low_noise.json
new file mode 100644
index 0000000..ab4d842
--- /dev/null
+++ b/examples/filters/filters_low_noise.json
@@ -0,0 +1,7 @@
+{
+  "flow_ema_alpha": 0.3,
+  "force_median_window": 3,
+  "force_lowpass_cutoff_hz": 10.0,
+  "force_lowpass_order": 2,
+  "force_lowpass_sample_rate_hz": "auto"
+}
diff --git a/examples/filters/filters_off.json b/examples/filters/filters_off.json
new file mode 100644
index 0000000..08fcdda
--- /dev/null
+++ b/examples/filters/filters_off.json
@@ -0,0 +1,7 @@
+{
+  "flow_ema_alpha": 1.0,
+  "force_median_window": 1,
+  "force_lowpass_cutoff_hz": 0.0,
+  "force_lowpass_order": 2,
+  "force_lowpass_sample_rate_hz": "auto"
+}
diff --git a/tests/test_filter_presets.py b/tests/test_filter_presets.py
new file mode 100644
index 0000000..3120c44
--- /dev/null
+++ b/tests/test_filter_presets.py
@@ -0,0 +1,90 @@
+"""The shipped filter presets and the example configs that document them.
+
+``json.load`` cannot carry comments, so the answer to "which filter should I
+use?" lives in three places that must not drift apart: ``FILTER_PRESETS`` in the
+sensor, the table in ``docs/filters.md``, and the copy-paste files in
+``examples/filters/``. The presets are the source of truth; these tests fail
+when a copy stops matching them.
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+
+from orisys import Sensor
+from orisys.calibration import filters_fingerprint
+from orisys.sensor import FILTER_PRESETS, available_filter_presets
+from orisys import configs as orisys_configs
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+EXAMPLES = REPO_ROOT / "examples" / "filters"
+BUNDLES = ("box", "mini", "finger")
+
+#: What every shipped bundle says: filtering is opt-in, so a fresh install
+#: records the raw reading and the operator turns a stage on deliberately.
+ALL_OFF = {
+    "flow_ema_alpha": 1.0,
+    "force_median_window": 1,
+    "force_lowpass_cutoff_hz": 0.0,
+    "force_lowpass_order": 2,
+    "force_lowpass_sample_rate_hz": "auto",
+}
+
+
+def test_the_preset_names_are_the_documented_ones():
+    assert sorted(available_filter_presets()) == [
+        "balanced",
+        "low_latency",
+        "low_noise",
+        "off",
+    ]
+    # ``available_filter_presets`` hands out copies: a UI cannot edit the truth.
+    snapshot = available_filter_presets()
+    snapshot["off"]["flow_ema_alpha"] = 0.0
+    assert FILTER_PRESETS["off"]["flow_ema_alpha"] == 1.0
+
+
+@pytest.mark.parametrize("preset", sorted(FILTER_PRESETS))
+def test_every_example_file_still_matches_its_preset(preset: str):
+    path = EXAMPLES / f"filters_{preset}.json"
+    assert path.is_file(), f"missing example for preset {preset!r}: {path}"
+    block = json.loads(path.read_text(encoding="utf-8"))
+    # A whole ``filters`` block: the preset's own keys on top of the defaults
+    # every config needs, and nothing else.
+    expected = dict(ALL_OFF)
+    expected.update(FILTER_PRESETS[preset])
+    assert block == expected, f"{path.name} drifted from preset {preset!r}"
+
+
+def test_every_example_file_is_a_real_filters_block():
+    """A file that cannot be dropped into a config is documentation that lies."""
+    for preset in FILTER_PRESETS:
+        block = json.loads((EXAMPLES / f"filters_{preset}.json").read_text(encoding="utf-8"))
+        assert isinstance(block, dict) and block, preset
+        for key in ("flow_ema_alpha", "force_median_window", "force_lowpass_cutoff_hz"):
+            assert key in block, f"{preset}: {key} missing"
+
+
+@pytest.mark.parametrize("bundle", BUNDLES)
+def test_shipped_bundles_ship_with_filtering_off(bundle: str):
+    """Nothing filters unless it was asked for."""
+    path = orisys_configs.resolve_sensor_config_path(bundle)
+    assert path is not None and path.is_file(), f"missing bundle: {bundle}"
+    cfg = json.loads(path.read_text(encoding="utf-8"))
+    assert cfg.get("filters") == ALL_OFF, f"{bundle} no longer ships with filtering off"
+
+
+@pytest.mark.parametrize("bundle", BUNDLES)
+def test_shipped_bundles_report_all_off(bundle: str):
+    """The file and the running device have to agree about the shipped default."""
+    sensor = Sensor("external", config_name=bundle, verbose=False, backend="cpu")
+    try:
+        fp = filters_fingerprint(sensor.filters_state())
+    finally:
+        sensor.disconnect()
+    assert fp["measurement"] == {"flow_ema_alpha": 1.0}
+    assert fp["readout"]["force_median_window"] == 1
+    assert fp["readout"]["force_lowpass_cutoff_hz"] == 0.0