The Universal PCXR4 personal or area air sampling pump features a 5 to 5000 ml/min flow range, timer, flow fault, and up to 12-hour run times for sampling particulates and gases/vapors. Includes charger and spare battery; both batteries measured 6.86 v. When tested, pump ran over 12 hours with a dust cassette at 2 Lpm. The pump is ideal for use with sorbent tubes, filter cassettes, and size-selective samplers to sample for chemicals, silica, asbestos and lead dust. Pictures show what you will receive: please ensure that this is adequate for your intended use. This current production model competes with Sensidyne Gilian GilAir5. This is used equipment; please see pictures for cosmetic wear. Same day priority mail shipping. PayPal only. Seller has 100% feedback, please contact me if you have questions.