The digital air pressure gauge is very precise. It measures pressures up to a maximum of 11 bar and is suitable for car and Presta valves. The air pressure measurement also works with the classic bicycle valve, but only in conjunction with the Schwalbe valve core. Check the tyre pressure at least once a month with a pressure gauge. The widely used thumb check is very unreliable. Already half the necessary pressure, most tyres feel tight. Insufficient air pressure is widely used in bicycles. The result is a dramatically increased rolling resistance and strong, premature wear of the tyres.