Tyre pressure gauges; automatic indicators of low pressure in vehicle tires (tyres); automatic indicators of low pressure in vehicle tyres; automatic indicators of low pressure in vehicle tyres (tires); tyre gauges; tyre monitoring apparatus; tyre monitoring instruments; wireless apparatus; apparatus designed to monitor the performance of apparatus; apparatus for monitoring electrical components; apparatus for monitoring electronic components; pressure monitors, other than for medical use; tyre monitoring apparatus; tyre monitoring instruments; tyre pressure monitoring system; wireless tyre pressure gauge; wireless tyre pressure monitoring system