The SB1000 and SB2000 are self-contained portable and wall mounted analyzers that utilize single beam infrared technology for a wide range of gases, ranges, and applications from 0-1% up to 0-100% volume. An optional electrochemical sensor for oxygen or other toxic makes one of these units a dual gas analyzer with built-in sample pump, digital display, outputs and alarms. CEA Instruments, Inc., www.ceainstr.com, (888) 893-9640.