In 1983, Otis Instruments developed an exclusive metal oxide, solid state sensor that operates at an approximate surface temperature of 250 degrees F. Making it ideal for use in both hot and cold temperatures, this unique surface temperature allos what is now known as the OI-240 H2S sensor to endure a full temperature spectrum--from deserts to ice fields. Today, Otis Instruments offers a complete line of catalytic bead, infrared, solid state and electrochemical sensors in a compatible sensor assembly. Customizable for a variety of gases, these sensors have gien many industry experts reason to call Otis Instruments the world's foremost authority in gas detection. For specific product information, please choose a subcategory from the list on the left.