E Instruments’ BTU4500-NOx portable flue gas analyzer is designed for emissions monitoring, maintenance and tuning of boilers, burners, engines, furnaces, turbines, kilns, incinerators and many other industrial combustion processes. It fea-tures: built-in printer, full color graphic display, automatic data saving, expanded internal memory (2,000 tests), and Blue-tooth wireless communication and software. It includes: three gas sensors — O2, CO, and NO; upgradable fourth sensor — NO2, SO2, or CxHy (HC); and dilution pump for CO auto-range — measurements up to 50,000 ppm. E Instruments International.