My daughter age 12 just became certified. We went diving in Belize for a week and she did great . However, my diving was more stressful because I wanted to check her air even after she would check and show me. I have noticed the new computers that show your buddy's air supply. Can someone suggest the models they prefer and if they like the ability to monitor their buddy's psi, I feel like it might help me be more at ease? Also, she is using dive tables but would like a computer for her with back light and very simple to start out with, suggestions for her? Thanks!