Play up to 5x longer with the same balls
With manometer for extra easy use
For 3 tennis or padel balls
Use any bicycle pump (read instructions)
Pressurize up to 2.5 bar
 
Store your tennis and padel balls under high pressure and prevent them from deflating. This way you play 5 times longer with your balls, stop spending unnecessarymoney on new balls.  Simply add pressure with any bike pump and look on the manometer when to stop. It is as simple as that.