The MSA Chillgard NH3 Gas Monitor provides fast, reliable detection of parts-per-million (ppm) levels of ammonia, down to -40 ºC. World-class design and engineering offer a single-board design for ultimate reliability and serviceability in an economical package. The full-scale range of the unit is 0-1000 ppm, with the capability of measuring a leak as low as 10 ppm, well below the established threshold limit values for ammonia.