I've tried 5 different inflators. This was the worst of the 5. Maybe it should have 2 stars as the counter was great. However, the bus connection was so bad that I couldn't bring myself to do it. The bus connector was constantly leaking, even when not connected. After connecting to the bus it was even worse with air bubbles. I had to try 7 or 8 times to get the connection good enough for more air to come in than come out. Needless to say, he returned.