This Foxboro Analytical portable gas Chromatograph is a fixed filter (3.48 microns) infrared analyzer designed for total petroleum hydrocarbon (TPH) analysis. There is an analog meter for display of measurements.

NOTE: It works, but is not calibrated, and is sold as-is, final sale.  We are not sure if it would be able to be calibrated.  There is a window/slit/lens of the left side of the unit.  There are scratches in the surface, so that may make it unable to be calibrated.  It appears the person who took the photo did some photoshop work.  You see the black smudge to the right of the handle?  Well that section, as well as the circle within it is actually rusted.