Results you can trust in monitoring microbial air quality. Programmable sampling delay up to 59 minutes eliminating remote control devices. Use standard 100mm Petri dishes. The MAS 100 was developed on the Andersen Air Sampler Principle with collection apertures that correspond to Andersen Level 5 for excellent recovery of viable particles as small as 1m. All models include a built-in calibration reminder that can be set between 1 and 12 months, and calibration is made easy with the new digital anemometer 39182-82 (sold separately). Internal software is easily accessed and controlled using single touch yes or no responses and pre-programmed volumes assure reproducible results. Air flow is 100 liters/minute. The unit and lid cover are both made of anodized aluminum and the lids are autoclavable. Power is supplied via NiMH rechargeable batteries. The display is alpha-numeric LCD, 16 digits with real time and date.