Convenient pump / Convenient pump

When pump bicycle, we don't know if it is appropriate to the tyre pressure, often judged by
pressing the tire, this led to two problems:
1. Hand contacts dirty tires, no health,
2.worry the tire burst.
Convenient pump is a bicycle pump, which with a trumpet and LED lights.
It can measure the tyre internal pressure.When there is enough gas it will remind you, help
you to judge whether the tire up enough.