Tough, Waterproof, USA Made: Hydrogen Sulfide Detector, Meter & Monitor - H2S Detector, Sensor (H2S Inspector by Sensorcon) Details & Demo at: http://www.sensorcon.com/inspector-portable-gas-detectors/ Measure H2S with 1ppm resolution from 0-400ppm Waterproof (just in case!) Designed & Made in the USA The best customer support from Sensorcon Leading Technology Minimal cost Professional Quality