gas safety device 1)Unit:ppm, mA, %,%LEL,%VOL 2)Display:backlight LCD, ... easy installation and maintenance. * Multi-parameter backlight LCD display: measuring range,digital gas reading ,units, bar graph , system status etc.* International ... .(on request)Operating temperature: Sensor dependent, -40~70C(typical) Humidity range: 15-95% R.H. (non-condensing) Enclosure: Cast aluminumSize: 160mm ...