Review on BW Technologies MCXL-XWHM-Y-NA GasAlertMicroClip XL: Advanced 4 Gas Detector for CO, H2S, LEL and O2 in Vibrant Yellow by Shane Grosland

Bought one of these late April 2020. The calibration is already finished. Tried to check and recalibrate. It fails every time. It was stated that the calibration takes almost 12 months. Obviously not true. Was in 2 environments with presence of H2S. The meter never detected H2S while other meters in the company did. Revain does not honor the warranty at all. If you're buying a gas meter, don't buy here