I have Missleworks RRC3x altimeters already but I like to also utilize different manufacturers to co ride for redundant deployment as well as back up data. And just fun. These will be riding in everything from 54mm , 75mm and 98mm minimum diameter projects and larger. Not looking for anything with on board gps or telemetry. Have separate tracking . Let's hear those suggestions, uses and recommendations. Leaning towards the MARSA33 or Raven with cost and what they do.