Choice of low ppb, low ppm, mid-range ppm, and high %RH VOC optimized smart PID sensors. Excellent sensitivity, very low limits of detection (down to <5 ppb); crucial for IAQ/green building applications;%RH and °C/°F are also included; add up to 5 specific gas sensors, in addition to the PID, in one probe. Choose from 25 different electrochemical gas sensors, such as formaldehyde (HCHO) carbon monoxide (CO), ozone (O3), ammonia (NH3), Cl2, H2S, NO2, NO, SO2, ClO2, HCN and more.) Ideal for screening for if/when and where air sampling might be advised. Rapid response; ideal for “blood hounding” VOC sources.