GA24XT- M Gas Alertclip Extreme – CO Description Description Range 0 – 500 PPM 24 Month life Water-resistant Built-in concussion-proof boot Related products 58L-421 – CALIBRATION GAS 58L QT-XWHM-A-Y-NA Gas Alert Quattro BWC2-S24 Gasalertclip Extreme – SO2 MCXL-XWHM-Y-NA BW Gas Alert Microclip XL