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 .
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