The manometer is designed to measure excess pressure. Gauge is brand new and never used. Manometer is in good condition. Original, high-quality 1980. For automatic control of pressure on the equipment of liquid and gas-forming media. Rare. Very high quality. The product has small signs of long storage. Vintage New Soviet Pressure Gauge Showing M1 4 Pressure Gauge Document Good Condition. Diameter 180mm. Thickness 50mm. Weight 348 grams. See details in the photo. Thank you !