3015MR is a Series 3000MR Photohelic® Switch/ Gages combine the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gage employing the durable, time-proven Magnehelic® gage design. The switch setting is easy to adjust with large external knobs on the gage face. Gage reading is unaffected by switch operation - will indicate accurately even if power is interrupted. 3000MR is employ versatile electromechanical relays with gold over silver contacts - ideal for dry circuits. Typical applications include pneumatic conveying, air conditioning systems and clean rooms.