Compact, Light Weight Intelligent Unit with Application Specific Sensors Sensitive to PPB / PPM or %V/V 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 scope for user error. It has inbuilt Alarm with Vibration. These compact, self contained and intrinsically safe designs are housed in a weather proof and dust resistant high impact plastic.