Expand all in position in the tire pressure gauge
As shown in the figure. It can be seen that the tire pressure gauge has two turns, one is the English unit of psi, and the other is the unit of kg / cm ^ 2, and 2.5 is the black number of the inner ring.
A tire pressure gauge or tire pressure gauge is a special type of pressure gauge designed to measure the pressure in the tires of automobiles, trucks, and bicycles. The tire pressure gauge adopts pressure sensing technology, which has high measurement accuracy (error is less than 0.05%) and long service life.
References: tire gauge manufacturers