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Measuring range: EX:0-100%LEL; O2:0-30%VOL CO:0-500ppm H2S:0-100ppm; or customized; Resolution: EX:1%LEL; O2:0.1%VOL CO:1ppm H2S:1ppm; or customized; Precision: ≤±3%FS; Alarm mode: Audible-visual ...