I finally broke down and bought my own personal analyzer after reading an article about how if you meet up with a buddy you should also analyze their gases because it is possibly your emergency gas plus i would feel horrible if something were to happen because of something as basic as that. I know there are several types of analyzers, HE, CO, O2 etc and im not trying to turn this into a gaggle of people arguing about which ones, you either own one or use the shops.