5-pack AirChek® XR5000 Pump Kit, high flow and low flow sampling, with five each: XR5000 pumps with high-power Li-Ion battery, filter cassette holders, adjustable low flow holders, constant pressure controllers, protective Type A tube covers, (1) five-station Multi-charger, 100-240V, and one carry case. Flow range: Constant flow 5 to 5000 ml/min Low flows from 5 to 500 ml/min require a low flow adapter kit. UL approved for intrinsic safety.