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).