Heavy-Duty Bike Tire Gauge Presta Valve Air Chuck - 15 PSI Tire pressure reading made easy. Accu-Gage helps maximize your tires life and performance through all types of bike terrains and weather conditions. The compact design allows for easy storage and quick and accurate reading in seconds. Overinflated. No worries, simply press the deflation button to release extra air from your tires for precise tire pressure. Featuring: Highly accurate dial gauge provides range of measurement; PSI (0 to 15), The bourdon tube movement can withstand any temperature, humidity, altitude or air stream contaminants, Meets ANSI B40.1 Grade B specifications to ensure a rapid and accurate reading, Heavy-duty protective rubber boot shields gauge against impact, Deflation button to release extra air from your tires for precise tire pressure adjustment, No batteries required.