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Pressure gauges are leaky and a bit difficult to use effectively, and you don't always have one available. This no-battery sensor is powered and read by a smartphone to provide pressure measurements for your bike tires.

To use with Presta bike tire valves, the valve must have a removable core. Remove the core from the valve stem and thread this extension between the valve and the core.

This tag is operable with Android phones. Android app available on request.

Specs:
- Read distance: ~20 mm with Android smartphones
- Battery life: No battery. Powered wirelessly by reader
- Pressure range: 0 to 440 psi

Patent pending