This a read-only powerpoint that is split up into 7 distinct sections of slides in order to teach the basics for checking the refrigerant charge of an air conditioning or heat pump system during A/C mode. Make sure to view this powerpoint in "Presenter View" in order to see the notes for each slide. 
 
Slides 1-33 Reading Compound Gauges & Understanding Saturated Refrigerant
Slides 34-42 Airflow and Metering Device Type
Slides 43-61 Connecting the Gauge Set and Air Purging
Slides 62-73 Methods for Checking the Charge
Slides 74-96 Checking the Charge of a Running A/C System
Slides 97- 102 Delta-T Measurements
Slides 103- 114 The Disconnect Procedure