Measurements and units of Measurements / Reference Interval (Dr. Affi 1)

Link to Lecture Note 

https://drive.google.com/file/d/14XglynZAAR435_n62fJwWMuBfDfSTSWe/view?usp=drivesdk

Extra Note on Reference Interval by Dr. Lucius

https://drive.google.com/file/d/1JNTPgymM20HruKwWzJOSxQez7mS-pplN/view?usp=drivesdk