When the time comes to recharge your vehicle’s
  A/C, the A/C Pro® phone app is here to help you.  Step by step
  instructions, specifically tailored to your vehicle, guide you through the
  process. From locating the low side pressure port to letting you know when
  the recharge is complete, the instructions are seamless and easy to follow.   
  Don’t feel like reading instructions? 
  Alternatively, The app also provides instructional videos that are also
  specific to your vehicle’s year make and model to help guide you through the
  recharge process.   
  Perhaps you just need help in locating the
  low side port.  The app  includes access to the low side port
  finder – a robust image database showing where low side ports reside for most
  vehicles.   
  The App also provides access to the A/C
  spec database, which provides refrigerant and oil specifications and
  capacities by vehicle.   
  If you still need additional help using an
  A/C Pro product the app will connect you directly with our support team.   
  Thank you for choosing A/C Pro for all of
  your Auto A/C needs.