Tough, Waterproof, USA Made: Hydrogen Sulfide Detector & Monitor, H2S Sensor & Pump Kit (H2S Inspector Kit) Details & Demo at: http://www.sensorcon.com/inspector-portable-gas-detectors/ Measure H2S in Air from 0-400ppm (+/-1ppm resolution) Waterproof (just in case!) Designed & Made in the USA The best customer support from Sensorcon, Inc. Leading technology minimal cost professional quality