... and err-free.Features: 1. 0.1cfm (2.83lpm flow rate);2. Six particle-size channels (0.3, 0.5, 1 ... , 1.0, 2.0, 3.0, 5.0µm)Flow rate 0.1cu.ft./min (2.83 L/min)Light source ... 0.5¦ÌmCommunication modes RS232 via DB9Communications protocol 9,600bps baud rateUser interface and display 320 x 240 pixels high resolution ...