Multi-gas protection in single-gas size unit enables true portability. With one to four-gas configurations, one instrument can be carried for continuous monitoring or be used with the integrated sampling pump for sample-draw applications such as confined space entry testing. IP66/67 rugged design provides exceptional durability in harsh, extremely dusty and wet applications. Interchangeable lithium-ion and alkaline battery packs provide power flexibility. Rechargeable lithium-ion battery packs offer day-to-day use for up to 12 hours continuously or the rechargeable lithium-ion extended range battery packs offer use for up to 20 hours without the pump. PEAK reading storage provides review of highest exposure conditions after alarm events without the need to download. STEL and TWA readings and alarms provided. Ultra bright visual, 95 dB audible and strong vibration alarms provide multiple warnings. On-board continuous datalogging stores a minimum of three months of data. Programmable bump test mode prompts user to bump test instrument on a regular basis and provides an alarm that prevents use if bump test has not been performed. Quick-Cal calibration mode saves time and money by allowing all sensors to be calibrated simultaneously using one cylinder of blended calibration gas. Unit is DSX Docking Station™ compatible providing automatic calibration, bump testing, instrument diagnostics and record keeping. iNet™ Ready. Unit includes soft carry case unless otherwise noted. Available in safety orange and black. English. UL®/CSA Approved. Made in USA.