Review on Cordless Tire Inflator with Digital Pressure Gauge: Portable Air Pump for Car and Bike Tires - Rechargeable Li-ion Battery & DC 12V Car Power Adapter Included by James Salem

This tool really comes in handy. Not only for inflating tires, but also with nozzles for inflating sports balls and other inflatable objects (swimming pools, furniture, etc.). It has some nice tire characteristics. You can use it to check the current air pressure. If you need more pressure, just dial in the correct number, pull the trigger and it will automatically stop when that pressure is reached. This is far more convenient than doing it at a gas station or bothering with a full-size compressor. Besides, you can put it in your car and use it anywhere you need it. It comes with a hard plastic case containing the instrument and all accessories. It's lightweight, even with the battery attached. One thing I found is that it stays on with an LED indicator when you connect the battery. To turn it off, hold down the R button until it turns off. It might have a timer to turn off automatically, but I'd rather not waste battery.