Intercomp 2.5" Deluxe 60PSI Air Pressure Gauge: Includes a high-quality, thumb operated bleeder and swivel nozzle on a 17" Hose. High visibility with major and minor graduation marks. 2.5" Air Pressure Gauge Liquid-Filled 0-60 psi. The liquid filling helps to reduce variations due to temperature and external pressure. Addiitonally, the liquid helps the gauge to be more shock resistant.