diff --git a/environment-dev.yml b/environment-dev.yml
index 99c3e32..bf66a56 100644
--- a/environment-dev.yml
+++ b/environment-dev.yml
@@ -3,10 +3,10 @@ channels:
 dependencies:
   - adlfs
   - build
+  - cfchecker
   - gcsfs
   - ipytree
   - matplotlib
   - mamba
   - notebook
   - sentinelsat
-
diff --git a/tests/slow_test_reformat.py b/tests/slow_test_40_reformat.py
similarity index 100%
rename from tests/slow_test_reformat.py
rename to tests/slow_test_40_reformat.py
diff --git a/tests/slow_test_50_cfchecker.py b/tests/slow_test_50_cfchecker.py
new file mode 100644
index 0000000..579d36a
--- /dev/null
+++ b/tests/slow_test_50_cfchecker.py
@@ -0,0 +1,76 @@
+import pathlib
+import typing as T
+
+from cfchecker import cfchecks
+import pytest
+import xarray as xr
+
+pytest.importorskip("netCDF4")
+
+DATA_FOLDER = pathlib.Path(__file__).parent / "data"
+
+
+def cfcheck(path: str):
+    (
+        badc,
+        coards,
+        debug,
+        uploader,
+        useFileName,
+        regionnames,
+        standardName,
+        areaTypes,
+        cacheDir,
+        cacheTables,
+        cacheTime,
+        version,
+        files,
+    ) = cfchecks.getargs(["cfchecks", path])
+
+    inst = cfchecks.CFChecker(
+        uploader=uploader,
+        useFileName=useFileName,
+        badc=badc,
+        coards=coards,
+        cfRegionNamesXML=regionnames,
+        cfStandardNamesXML=standardName,
+        cfAreaTypesXML=areaTypes,
+        cacheDir=cacheDir,
+        cacheTables=cacheTables,
+        cacheTime=cacheTime,
+        version=version,
+        debug=debug,
+    )
+    for file in files:
+        try:
+            inst.checker(file)
+        except cfchecks.FatalCheckerError:
+            print("Checking of file %s aborted due to error" % file)
+
+    totals = inst.get_total_counts()
+
+    return totals
+
+
+def test_cfcheck(tmpdir: T.Any) -> None:
+    product_path = (
+        DATA_FOLDER
+        / "S1B_IW_GRDH_1SDV_20211223T051122_20211223T051147_030148_039993_5371.SAFE"
+    )
+
+    groups = [""]
+    while groups:
+        group = groups.pop()
+        print(group)
+        try:
+            ds = xr.open_dataset(product_path, engine="sentinel-1", group=group)
+            groups.extend(f"{group}/{g}" for g in ds.attrs.get("subgroups", []))
+        except:
+            pass
+        nc_path = tmpdir.join(group.replace("/", "-") + ".nc")
+        ds.to_netcdf(nc_path)
+
+        totals = cfcheck(str(nc_path))
+
+        assert totals["FATAL"] + totals["ERROR"] + totals["WARN"] == 0
+    
\ No newline at end of file
diff --git a/xarray_sentinel/conventions.py b/xarray_sentinel/conventions.py
index 9431771..ec0a855 100644
--- a/xarray_sentinel/conventions.py
+++ b/xarray_sentinel/conventions.py
@@ -76,7 +76,7 @@
     "gamma": {"units": "m m-1", "long_name": "gamma calibration LUT"},
     "dn": {"units": "1", "long_name": "original digital number calibration LUT"},
     "noiseRangeLut": {"units": "1", "long_name": "range thermal noise correction LUT"},
-    "noiseAzimithLut": {
+    "noiseAzimuthLut": {
         "units": "1",
         "long_name": "azimuth thermal noise correction LUT",
     },
@@ -96,6 +96,18 @@
         "units": "1",
         "long_name": "polynomial to convert from slant range to ground range",
     },
+    "t0": {
+        "units": "s",
+        "long_name": "Two-way slant range time origin",
+    },
+    "data_dc_polynomial": {
+        "units": "1",
+        "long_name": "Coppler centroid estimated from data",
+    },
+    "azimuth_fm_rate_polynomial": {
+        "units": "1",
+        "long_name": "Azimuth FM rate coefficient array",
+    },
     "measurement": {"units": "1", "long_name": "digital number"},
 }