... device 1)Unit:ppm, mA, %,%LEL,%VOL 2)Display:backlight LCD, LED 3)Humidity: 10-95%RH (non condensing) ... simple and easy installation and maintenance. * Multi-parameter backlight LCD display: measuring range,digital gas reading ,units, bar graph ... and Play! .* Sensor replacement without recalibration, automatic sensor data recognition. Sensor fault signal output monitoring and indicating.* Programmable ...