WatchGas SST4-MINI External Filter SST4-MINI-XFIL-10 (10/pk) RKI Controllers Another good option would be

Another good option would be a 3M 7500 Respirator

5 ppm ceiling per the NIOSH Pocket Guide)

and shock-resistant

GL4003KL - Large

WatchGas SST4-MINI External Filter SST4-MINI-XFIL-10 (10/pk) RKI Controllers Another good option would beProtect your gas detection accuracy with the WatchGas SST4 MINI External Filter. These replaceable filters block fine dust and particulates before they reach your sensor, extending equipment life and ensuring reliable readings. Each pack contains 10 filtersthe essential maintenance component for your WatchGas SST4 MINI Diffusion 4 Gas Detector. Keep your detector performing at peak sensitivity with fresh filters on hand. SST Accessories Brochure: Part