| VQ621T/2 | SGX Sensortech | VQ21 PELLISTOR, VQ600 HEAD, 0.5" | - | 2,610 | 
                                                    
                            | IR601/3 | SGX Sensortech | IR SENSOR HEAD FOR 0-5%CO2 - 3/4 | - | 4,176 | 
                                                    
                            | IR604/1 | SGX Sensortech | IR SENSOR HEAD FOR 0-100% LEL AC | - | 5,670 | 
                                                    
                            | MF010-2-LC1 | Honeywell Sensing and Productivity Solutions | MF010 LOW TEMP OXYGEN SENSOR | - | 7,542 | 
                                                    
                            | MF020-1-LC4 | Honeywell Sensing and Productivity Solutions | MF010 HIGH TEMP OXYGEN SENSOR | - | 2,754 | 
                                                    
                            | CCS801B-COPR | ams | GAS SENSOR | - | 8,604 | 
                                                    
                            | 27930 | Parallax Inc. | METHANE GAS SENSOR MODULE | - | 5,472 | 
                                                    
                            | 605-00010 | Parallax Inc. | CARBON DIOXIDE GAS SENSOR | - | 4,572 | 
                                                    
                            | 110-102 | SPEC Sensors, LLC | SENSOR GAS CO ANALOG CUR MOD | - | 6,360 | 
                                                    
                            | SEN-10916 | SparkFun Electronics | HYDROGEN GAS SENSOR - MQ-8 | - | 6,084 |