Review on Measure Your Tire Pressure With Precision: FOVAL'S Digital Tire Pressure Gauge For Cars At 150 PSI by Daniel Espinoza

Works as advertised. In the U.S. press the silver On button to select PSI as there are other scales for other countries.One comment: The instructions state "Temperature measurement range: 30 to 122 F (0 to 50 degrees Celsius)" Think is means the current ambient temperature when using the pressure gauge as no where in the on-line advertising is measuring the giving a temperature measurement mentioned. Think this more accurately should state: Operating temperature range .