This overall score is made up of accuracy (70%), display (15%) and ease of removing the sensor to adjust tyre pressures (15%).

The tyre sensors were fitted and paired to the display device as per the manufacturer’s instructions. Tyre pressures were adjusted to 35psi using a calibrated reference pressure gauge, and then readings were taken from the device’s in-car display. The results were averaged and then scored according to the difference from the reference reading.

The display was assessed for quality and clarity of readings.

The sensors were removed from the tyres to evaluate how easy it is to adjust tyre pressure if required.

Our CHOICE Buys scored 90% or above for accuracy.

Recommended retail price February 2016. You may be able to find better deals by shopping around.

All the products in this test come supplied with four sensors but some allow for extra sensors to be added to the system for use with caravans and trailers etc. 

The range of pressures at which the sensors are claimed to be accurate. Be sure to choose the product that's suitable for your application. Four-wheel-drives may use pressures below 20 psi, regular road cars usually somewhere between 25 and 40 psi, and some caravans and trailers requiring over 50 psi.

The recommended operating temperature range of the sensors. 

The type of replacement battery required for each sensor.

A list of the items supplied with each system tested.

Detects a fast leak and sends an alert to the display unit. This allows the driver time to slow down or stop safely before the tyre becomes severely deflated.