... 3.6mA Smart 4-20ma combustible gas leak detector with lcd display and alarm Technical features:1) 4-20mA, 3 wire ... and easy installation and maintenance. 3) Multi-parameter backlight LCD display: measuring range,digital gas reading ,units, bar graph , ... 8) Display mode: Backlight LCD, LED9) LCD display type: 5-digit 7-segment main display 8-digit 14-segment additional display 52 bars meter with 2% ...