The 2i (and its 2i‑N variant) is a rugged, portable digital aerosol photometer designed for in‑situ integrity testing of filters in cleanrooms, pharmaceutical manufacturing, biosafety cabinets and even nuclear environments

Key features include a large 4.3″ LCD touchscreen interface (on some models) for intuitive control, user‑settable aerosol noise suppression for stable measurement, USB or optional thermal printer output for reporting in continuous, monitoring or summary modes, and (in the 2i‑N version) a sealed sample train enabling safe use in hazardous environments and compliance with standards such as ASME N511/510/509 and AG‑1