How to Calibrate BW Honeywell GasAlert Max XT II Portable Gas Detector

Rick Pedley, owner and president of PK Safety, explains how to calibrate the popular BW Honeywell GasAlert Max XT II portable gas monitor. This detector monitors for H2S, CO, O2, and LEL. Shop for it here https://pksafety.com/bw-honeywell-gas...