gas safety device 1)Unit:ppm, mA, %,%LEL,%VOL 2)Display:backlight LCD, LED 3)Humidity: 10-95%RH (non condensing) Gas transmitter Technical features* 4-20mA ... body design acc. to IEC61508,simple and easy installation and maintenance. * Multi-parameter backlight LCD display: measuring range,digital gas reading ,units, bar graph , system ...