This digital tire gauge produced the most accurate readings, earning it The Best rating from the Hammacher Schlemmer Institute. Analysts tested each gauge at three different pressures and compared the results to those taken with a professional mechanic’s tool. While lesser models were off by as much as 15 PSI, The Best Digital Tire Pressure Gauge's results were nearly perfect, only off by .3 PSI. It was also rated as the unit with the highest build quality due to its construction comprised of metal fittings and a high-grade hose. Lauded as the model with the most features, it has a hold option, 360° rotating head, LCD screen, green backlight, and a range from 3-150 PSI. Requires two AAA batteries. 173/4" L x 3" W x 11/4" D. (2 oz.)