Tire Inflators?

[celticus]

Accuracy is a must and the carrying case is cool but $69 bucks is to rich for my current bank book. I carry a bike master gauge 0-60 lb with no cool case. It has a flexible fiber covered hose, rubber covered gauge face and swivel angled head . It feels nice and substantive but as for testing the accuracy I don't know. I did a test with about 10 gauges I had laying around and found a 15 lb variance in the gauges. I really don't know what to use as a point of reference and only half an idea how to test my gauges as I have no scientific background.

Mark