... gas safety device 1)Unit:ppm, mA, %,%LEL,%VOL 2)Display:backlight LCD, LED 3)Humidity: 10-95%RH (non ... simple and easy installation and maintenance. * Multi-parameter backlight LCD display: measuring range,digital gas reading ,units, bar graph , system ... programmable software for configuration and maintenance on-site, field or remote operation separate from the control units. * Automatic temperature ...