Innovative central push button air release. Easy to use by left or right handed users, Shock proof constuction for unsurpassed durability. Unique pressure distribution (German Patent Pending) for smooth and accurate measurement. Easy to read Blue on White 56mm diameter scale. 50% larger inflation bulb for faster inflation. Adjustable spoon handle for both left and right handed operation. High quality single tube with velcro fastening. Washable and latex free. Heine 5 year guarantee