Honeywell BW GasAlertQuattro multi-gas detector. It is a portable device used for surveying levels of gases such as H2S, oxygen (O2), carbon monoxide (CO), and combustibles in industrial environments.
The device is also known as the BW Technologies QT-XWHM-R-Y-NA GasAlertQuattro.
It is a portable 4-in-1 gas detector.