PKL Technologies Inc. manufactures tunable diode laser (TDLAS) based gas detectors and monitors. Spectra-1 open path gas sensors are used in a variety of environmental and safety remote sensing applications. Spectra-1 gas sensors have been designed in a compact, easy to use, robust and portable format. Spectra-1 has been developed using proprietary hardware and software, to produce a low cost alternative for open path gas monitoring. Spectra-1 can operate from a 1 to 1000 meter path length. Spectra-1 units are available in hydrogen fluoride (HF), ammonia (NH3), carbon dioxide (CO2), Carbon monoxide (CO), methane (CH4), acetylene (C2H2), ethylene (C2H4), and others. Spectra-1 is used for: portable gas detection, open path gas detection, landfill gas detection, continuous emission monitoring, emission reduction, ambient air monitoring, carbon dioxide monitoring, methane monitoring, HF monitoring, leak detection, fugitive emissions and fence line monitoring applications.