20 For it is perfect, the unit is small and light, well protected inside the case. An LED integrated along the top allows to see clearly at night, the blue screen is readable. The tip rotates 360 ° to allow to adapt to the position of the valve, firm pressure gives the instantaneous reading of the pressure, I was afraid it do lose pressure each audit, the fact is nothing if it is in front of the valve. Regarding the "button" opposite the valve that allows deflate if too much pressure, it is not a button at all but a fixed footprint that once introduced into the deflate valve until it stops with support. It can store up pressure for the front and back but this is a simple memo recorded on the screen that serves no other, no audible or visual signal if the detected pressure is above or below, nothing. You can set the camera for 'PSI' or 'BAR' according to the desired unit. A signal 'Lo' is displayed if the batteries are too weak, there are 2 CR2032. Attention however has a point: the supplied case is relatively flexible, enough to press the LED lighting, if you leave a little compressed under a saddle bike for example, the battery is empty alone (live) .. .