diff --git a/python_src/lasp/lasp_measurementset.py b/python_src/lasp/lasp_measurementset.py
index 9249c34..6973868 100644
--- a/python_src/lasp/lasp_measurementset.py
+++ b/python_src/lasp/lasp_measurementset.py
@@ -3,7 +3,8 @@ Provides class MeasurementSet, a class used to perform checks and adjustments
 on a group of measurements at the same time.
 
 """
-__all__ = ['MeasurementSet']
+
+__all__ = ["MeasurementSet"]
 from .lasp_measurement import Measurement, MeasurementType
 from typing import List
 import time
@@ -16,7 +17,7 @@ class MeasurementSet(list):
 
     """
 
-    def __init__(self, mlist: List[Measurement]=[]):
+    def __init__(self, mlist: List[Measurement] = []):
         """
         Initialize a measurement set
 
@@ -25,8 +26,10 @@ class MeasurementSet(list):
 
         """
         if any([not isinstance(i, Measurement) for i in mlist]):
-            raise TypeError('Object in list should be of Measurement type')
+            raise TypeError("Object in list should be of Measurement type")
 
+        # Sort by time stamp, otherwise the order is random
+        mlist.sort(key=lambda x: x.time, reverse=True)
         super().__init__(mlist)
 
     def getNewestReferenceMeasurement(self, mtype: MeasurementType):
@@ -46,7 +49,8 @@ class MeasurementSet(list):
         return mnewest
 
     def getReferenceMeasurements(self, mtype: MeasurementType):
-        """Get all reference measurements of a certain type
+        """Get all available reference measurements of a certain type in the
+        current set.
 
         Args:
             mtype (MeasurementType): The type of which to list
@@ -55,7 +59,7 @@ class MeasurementSet(list):
             a new measurement set including all measurements of a certain type
         """
         return [m for m in self if m.measurementType() == mtype]
-    
+
     def getNewestReferenceMeasurements(self):
         """Returns a dictionary with newest measurement of each type that is not specific returns None in case no measurement is found."""
         newest = {}
@@ -72,16 +76,15 @@ class MeasurementSet(list):
 
     def newestReferenceOlderThan(self, secs):
         """Returns a dictionary of references with the newest reference, that is still
-        older than `secs` seconds. """
+        older than `secs` seconds."""
         curtime = time.time()
         newest = self.getNewestReferenceMeasurements()
-        newest_older_than =  {}
+        newest_older_than = {}
         for key, m in newest.items():
             if curtime - m.time >= secs:
                 newest_older_than[key] = m
         return newest_older_than
 
-
     def measTimeSame(self):
         """
         Returns True if all measurements have the same measurement
@@ -117,4 +120,3 @@ class MeasurementSet(list):
             return all([first == meas.channelConfig for meas in self])
         else:
             return False
-