Constant flow air sampling pump features clear external filter housing allows an immediate visual inspection of filter’s condition. The flow fault indicator lights up if unit operates outside ±5% of set flow rate. Battery test indicator lights up when battery can provide a minimum of 8 hours of operation over operating range.

• Constant low flow module allows sampling from 5 to 500 cc/min
• Constant pressure (multiflow) module allows sampling from 1 to 750 cc/min

Basic model is easy to use, clock model provides elapsed-time clock display and the program model provides auto start-stop and delayed start times up to 9999 minutes.