Honeywell SPM Flex Chemcassette® Portable Tape-Based Gas Detector Improving safety and productivity with the most flexible, user-friendly tape-based gas detector for low-level toxics. it’s the right tape-based detector for your toxic gas monitoring system with the gas intelligence for low levels for Hydrides, Mineral Acids, Oxidizers & Amines. Also available are SPM Flex Consumables for your Honeywell SPM Flex Chemcassette® Portable Tape-Based Gas Detector