Laser spectrometers are complete instruments designed for specific gas sensing applications. Systems consist of an integrated mid-infrared laser and detector module cooled by a compact Stirling cycle refrigerator, optics for directing the mid-IR laser emission, DSP/FPGA electronics for controlling the laser and sampling the detector signal, a gas cell with sampling pump, and software for instrument control and data acquisition.  These instruments are ideally suited for applications where rapid (less than one second) and sensitive (typically sub-ppb) detection of specific molecules are required.  Flexible leasing terms are offered to satisfy the needs of limited budgets.