Compact, Light Weight Intelligent Unit with Application Specific Sensors Sensitive to PPB / PPM Or % i age levels of Gases & Vapors.The advanced Micro controller technology employed makes these ALERT METERS highly dependable, reliable and accurate. The complete automatic operation and calibration feature leaves no Complete Automatic Operation Self Diagnostic Check Backlit Alphanumeric Display Diffusion or Suction Sampling Audio & Visual Battery Alarms Simultaneous Display of Gas Name And Concentration Intrinsically Safe