modal3000Dependable, H 2 S Measurement Made Easy For The Field. The MODEL 3000RS Portable H 2 S Analyzer is the perfect choice for safely and accurately measuring ppm levels of H 2 S inThe S&W 3000 shotgun was an excellent piece,,,IMHO.. much like the Rem 870 but improved , such that it would cycle in case of a double feed... unlike the 870....