| IR602/3 | SGX Sensortech | IR SENSOR HEAD FOR 0-5%/100% HC | - | 8,262 | 
                                                    
                            | IR603/1 | SGX Sensortech | IR SENSOR HEAD FOR 0-5%/100% BRO | - | 3,418 | 
                                                    
                            | IR603/2 | SGX Sensortech | IR SENSOR HEAD FOR 0-5%/100% BRO | - | 2,610 | 
                                                    
                            | MF020-0-LC1 | Honeywell Sensing and Productivity Solutions | MF010 HIGH TEMP OXYGEN SENSOR | - | 8,730 | 
                                                    
                            | MF020-1-LC3 | Honeywell Sensing and Productivity Solutions | MF010 HIGH TEMP OXYGEN SENSOR | - | 2,052 | 
                                                    
                            | 27931 | Parallax Inc. | MOD GAS SENSOR CARBON MONOXIDE | - | 4,878 | 
                                                    
                            | MF010-0-LC1 | Honeywell Sensing and Productivity Solutions | SENSOR OXYGEN 24V 500MA | - | 4,842 | 
                                                    
                            | 27929 | Parallax Inc. | CARBON DIOXIDE GAS SENSOR MODULE | - | 6,228 |