BW Technologies provides a full range of gas detection systems, gas sensors, replacement parts, and accessories. The sensors produced by BW Technologies are some of the most accurate and reliable sensors on the market. The easy plug-in sensors are available with single or multigas detection capabilities. This specific product is a hydrogen sulfide plug-in replacement sensor and detects within the range of 0-500 ppm. It is for use with BW Technologies brand of gas detection instruments.