The Dwyer Series 4000 Capsuhelic Differential Pressure Gauge 4320 is a precision instrument designed specifically for measuring pressure in HVAC and refrigeration systems. Manufactured by the trusted brand Dwyer, this gauge is known for its accuracy and reliability. The model features a Capsuhelic design, which ensures accurate readings without the need for recalibration. With its focus on pressure monitoring, this differential pressure gauge is a valuable tool for professionals in the HVAC and refrigeration industry. NOS