The Haltec STD-LB Air Liquid Gauge is a standard liquid-filled pressure gauge designed for air and non-corrosive gas applications. It features a 2-1/2" dial with white background and black markings, bronze bourdon tube, and 1/4" NPT lower mount. The gauge provides accuracy within 2% of full scale reading. It has a pressure range of 0-100 psi, making it suitable for monitoring compressed air systems and control air applications. The liquid-filled design helps dampen vibration and pointer flutter.