Automatic Air Downs (Tire pressure) ?

Heading out onto the beach with the truck, letting out some air from the tires and notice someone doing the same to their vehicle but they were just standing next to the their truck while I was holding down the tire valve individually for all four wheels.
Someone said there is a device called "auto air downs".

Anyone use auto air downs? Do you like them? How well do they work?
I heard of them and was told they are about $70?

 

Bump, for interest!

 

never heard. did you try searching the internet first t get more info on them?

 

They're commonly sold at off road stores, they just screw on the valve stem and deflate the tire until the set PSI is reached.

 

A few companies make them. I found these are the best.

http://www.quadratec.com/products/95203_100.htm

 

i own a set of the staun tire deflators.. once you get them set to the right pressure they work really well. just take the cap off, screw them on and sit back and wait till they stop bleeding off the air. you set them to a ceratin pressure and thats where the stop at.

 

Thanks for the responses.
I did search the web and found this write up, kinda interesting!
Never knew there were so many similar products out there.

http://www.parksoffroad.com/prodreview/deflatortest/deflatormain.htm