Microtechnica offer a variety of Particle Counters for hire, from

Met One and Hiac Royco

Met One 3425

Air Particle Counter

ISO 21501-4 Compliant

(0.5µm - 10µm @ 50 LPM)

Hiac Royco 8000A/3000A/HR-LD150CE

Liquid Particle Counter

(2µm - 150µm @ 25 mls/min)