Tough, Waterproof, USA Made: Carbon Monoxide Tester, CO Meter, & Analyzer Kit with Sample Pump (CO Inspector Kit) Full Details & Video Demo at: http://sensorcon.com/carbon-monoxide-detectors/ Visual and audible alarms (35ppm & 200ppm), Waterproof and rugged construction Measure Carbon Monoxide with 1ppm resolution from 0-2,000ppm Includes hand pump for flue gas testing and storage case Designed & Made in the USA, 100% satisfaction guarantee