... -1/2", 2", 2-1/2", 4" (2)Case & cover: SS304, Steel (3)Accuracy: 3-2-3% Refrigerating Pressure Gauge(1)Diameter: 1-1/2", 2", 2-1/2", 4"(2)Case ... temperature in the medium or special media, such as the refrigerant (F Lee ammonia) or ammonia, used in, air-conditioning, refrigeratorCustomers ...