Dwyer 490A-5 Wet-Wet Digital Manometer 0 to 500 PSI Pressure measures positive and differential pressure from 0 to 500 PSI while being able to tolerate most liquid media compatible with 316LSS. The Dwyer 490A-5 manometer has field adjustable dampening, allowing the user to choose the level of display averaging rate corresponding to the fluctuation level. Additionally, the Dwyer 490A-5 features a backlit display for dimly lit areas, the ability to store up to 40 readings, and up to 7 different units of measure.