Four stage, air monitoring and purification system with carbon monoxide converter. Has a digital readout. 50 cfm capacity. Provides air filtration and monitoring for two operators using climate control tubes. Four operators if using flow control valves. Fittings not included. Order approved double action safety quick connects if required. Can be calibrated on site. Filters need changing every 3 months. BlastOne, your one-stop corrosion control supplies shop. Talk to your Area Manager for a custom system design.