Listed are NIOSH certified coal mine dust personal samplers and gas detector tube units, respiratory protective equipment and a bibliography of available test procedures. The names and addresses of manufacturers and applicable approval regulations are given. Gases covered by the detector tube units include carbon monoxide, nitrogen dioxide, sulfur dioxide, hydrogen sulfide, carbon dioxide, ammonia, chlorine, trichloroethylene, carbon tetrachloride, benzene, nitric oxide, hydrogen cyanide, toluene and acetone. A table gives the operation restrictions for the certified gas detector tube units. Respiratory protective devices include self-contained breathing apparatus, gas masks, supplied-air respirators and chemical cartridge respirators. Expiration of Bureau of Mines respirator approvals are listed for the above types of devices, tables are given for identification of approved component parts and pressure ranges, and hose length ranges are given for approved supplied-air respirators. Test procedures include that for the coal mine dust personal sampler unit pulsation dampener, for industrial sound level meter vibration sensitivity, industrial sound level meter amplifier distortion, humidification system for cartridges and canisters, carbon monoxide test system for canisters, safety-toe footwear compression and safety-toe footwear impact. View the current Certified Equipment List.