A heavy-duty 4 1/2" pressure gauge for use with a wide variety of pressure vessels, including our Quick-Opening Retorts. The PET case is highly impact- and chemical-resistant, with a high-temperature acrylic window. Easy-to-read dial is precision geared using stainless steel components. Reads from 30" HG vac to 30 psi, with an accuracy of ±0.5% of span. 1/2-14 ANPT brass connection.