So the other day it was extremely hot and I normally drive with the windows down but was bringing my son to work and he had dress clothes on so I decided to fire up the AC. It wasn't working right so I went to the parts store and bought one of those R-134 kits to charge yourself and didn't have a thermometer so I grabbed a Xikar hygrometer from one of the humidors and it worked just great. Kit cost $40 took about 10 minutes and saved me just about $100 to have it done at a shop around me.