Gulfstream51

Hello...I am new to Audi. Today my airbag light came on and I'd like to be able to at least diagnose the fault. I would very much appreciate it if I could get some feedback on a good Vagcom device to purchase that is reasonable in cost and will give me all the information I need for this problem and other issues. I DO NOT have a laptop, so I'm looking for a stand alone device. Your help is most appreciated. My Audi is a 2001 A4 B5.