3 files changed, 18 insertions, 14 deletions

diff --git a/glucometerutils/drivers/fslibre.py b/glucometerutils/drivers/fslibre.py
index 5031a04..85bfdab 100644
--- a/glucometerutils/drivers/fslibre.py
+++ b/glucometerutils/drivers/fslibre.py
@@ -101,18 +101,6 @@ def _extract_timestamp(parsed_record, prefix=''):
         parsed_record[prefix + 'second'])
 
 
-def _convert_ketone_unit(raw_value):
-    """Convert raw ketone value as read in the device to its value in mmol/L.
-
-    As per
-    https://flameeyes.github.io/glucometer-protocols/abbott/freestyle-libre.html
-    this is actually not using any mg/dL→mmol/L conversion, but rather the same
-    as the meter uses for blood glucose.
-
-    """
-    return raw_value // 18
-
-
 def _parse_arresult(record):
     """Takes an array of string fields as input and parses it into a Reading."""
 
@@ -160,7 +148,7 @@ def _parse_arresult(record):
         measure_method = common.MeasurementMethod.BLOOD_SAMPLE
         cls = common.KetoneReading
         # automatically convert the raw value in mmol/L
-        value = _convert_ketone_unit(parsed_record['value'])
+        value = freestyle.convert_ketone_unit(parsed_record['value'])
     else:
         # unknown reading
         return None
diff --git a/glucometerutils/drivers/fsprecisionneo.py b/glucometerutils/drivers/fsprecisionneo.py
index b818f8f..15be65c 100644
--- a/glucometerutils/drivers/fsprecisionneo.py
+++ b/glucometerutils/drivers/fsprecisionneo.py
@@ -89,4 +89,10 @@ class Device(freestyle.FreeStyleHidDevice):
                 raw_reading.year + 2000, raw_reading.month, raw_reading.day,
                 raw_reading.hour, raw_reading.minute)
 
-            yield cls(timestamp, raw_reading.value)
+            if record and record[0] == _TYPE_KETONE_READING:
+                value = freestyle.convert_ketone_unit(raw_reading.value)
+            else:
+                value = raw_reading.value
+
+            yield cls(timestamp, value)
+
diff --git a/glucometerutils/support/freestyle.py b/glucometerutils/support/freestyle.py
index 816af81..d18a81f 100644
--- a/glucometerutils/support/freestyle.py
+++ b/glucometerutils/support/freestyle.py
@@ -64,6 +64,16 @@ def _verify_checksum(message, expected_checksum_hex):
     if expected_checksum != calculated_checksum:
         raise exceptions.InvalidChecksum(expected_checksum, calculated_checksum)
 
+def convert_ketone_unit(raw_value):
+    """Convert raw ketone value as read in the device to its value in mmol/L.
+
+    As per
+    https://flameeyes.github.io/glucometer-protocols/abbott/freestyle-libre.html
+    this is actually not using any mg/dL→mmol/L conversion, but rather the same
+    as the meter uses for blood glucose.
+
+    """
+    return raw_value / 18.0
 
 class FreeStyleHidDevice(hiddevice.HidDevice):
     """Base class implementing the FreeStyle HID common protocol.