diff --git a/demo.py b/demo.py
index 5d94303a7f733f56acf5cc6dd42a3478b7f7af66..77e285ea1375645fba6ae781f4e96c33c89c9046 100755
--- a/demo.py
+++ b/demo.py
@@ -8,7 +8,8 @@ import yaml
 #
 # A very rough script to demonstrate 'nvcl_kit'
 #
-
+# NB: requires 'pyyaml' - install via 'pip3 install pyyaml'
+#
 
 # Provider list. Format is (WFS service URL, NVCL service URL, bounding box coords, local filtering, WFS version, max boreholes))
 prov_list = [ ("http://www.mrt.tas.gov.au:80/web-services/ows", "http://www.mrt.tas.gov.au/NVCLDataServices/", { "west": 143.75, "south": -43.75, "east": 148.75, "north": -39.75 }, False, "1.1.0", 20),
@@ -47,7 +48,7 @@ def do_demo(wfs, nvcl, bbox, local_filt, version, max):
     bh_list = reader.get_boreholes_list()
     print("len(bh_list) = ", len(bh_list))
 
-    # Print borehole details and Australian Stratigraphic Units Database records
+    # Print borehole details and relevant records from Australian Stratigraphic Units Database (https://asud.ga.gov.au/)
     for bh in bh_list[:5]:
         print("\nBOREHOLE:")
         print(yaml.dump(bh))
diff --git a/nvcl_kit/asud.py b/nvcl_kit/asud.py
index 14f41884ff209398c5d837fcd057a8ad0d077125..43f5ac6b0b26512c97762e3429f31583a36b2f58 100755
--- a/nvcl_kit/asud.py
+++ b/nvcl_kit/asud.py
@@ -121,11 +121,30 @@ def _get_asud_strat_no(lon, lat):
 def get_asud_record(lon, lat):
     ''' Retrieves a stratigraphy record from the 'Australian Strategraphic Units Database'
 
-    :param lon: longitude
-    :param lat: latitude
+    :param lon: longitude (float or string)
+    :param lat: latitude (float or string)
     :returns: stratigraphy record as a dict or None upon error or not found
     '''
-    strat_no = _get_asud_strat_no(lon, lat)
+    # Check input parameters
+    if not isinstance(lon, float):
+        try:
+            lon_flt = float(lon)
+        except (ValueError, TypeError):
+            LOGGER.warning("lon parameter is not a float")
+            return None
+    else:
+        lon_flt = lon
+
+    if not isinstance(lat, float):
+        try:
+            lat_flt = float(lat)
+        except (ValueError, TypeError):
+            LOGGER.warning("lat parameter is not a float")
+            return None
+    else:
+        lat_flt = lat
+
+    strat_no = _get_asud_strat_no(lon_flt, lat_flt)
     if strat_no is not None:
         try:
             resp = post(GSUD_API, data=json.dumps({"actionName": "searchStratigraphicUnitsDetails", "stratNo": strat_no}))
diff --git a/test/test_asud.py b/test/test_asud.py
new file mode 100755
index 0000000000000000000000000000000000000000..2346535e9f6d1be32e93d5538ec99ec3073670c1
--- /dev/null
+++ b/test/test_asud.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+import sys, os
+import unittest
+from unittest.mock import patch, Mock
+from requests.exceptions import Timeout, RequestException
+from owslib.util import ServiceException
+from http.client import HTTPException
+import logging
+
+from types import SimpleNamespace
+
+from nvcl_kit.asud import get_asud_record
+
+
+class TestNVCLAsud(unittest.TestCase):
+
+    def try_input_param(self, lon, lat, msg):
+        ''' Used to test variations in erroneous input parameters
+            :param lon: longitude (float)
+            :param lat: latitude (float)
+            :param msg: expected warning message
+        '''
+        with self.assertLogs('nvcl_kit.asud', level='WARN') as nvcl_log:
+            rec = get_asud_record(lon, lat)
+            self.assertIn(msg, nvcl_log.output[0])
+            self.assertEqual(rec, None)
+
+    def test_params(self):
+        ''' Tests exception handling in get_borehole_data()
+        '''
+        self.try_input_param(0.0, None, 'lat parameter is not a float')
+        self.try_input_param(None, 8.0, 'lon parameter is not a float')
+        self.try_input_param(None, "", 'lon parameter is not a float')
diff --git a/test/test_reader.py b/test/test_reader.py
index 358024a7492bdfe09ca98edcb518a5c7970ed193..03d023b67970e8762b0f07c94bde550cac91d23b 100755
--- a/test/test_reader.py
+++ b/test/test_reader.py
@@ -776,7 +776,3 @@ class TestNVCLReader(unittest.TestCase):
         self.assertEqual(log_list[0].log_id, 'b80a98e4-6d9b-4a58-ab04-d105c172e67')
         self.assertEqual(log_list[0].log_name, 'Imagery')
         self.assertEqual(log_list[0].sample_count, 30954)
-
-
-if __name__ == '__main__':
-    unittest.main()