Unit-Kinetics-Celerity URS 20August 24, 2012|Mass Flow Controllers, Unit-Kinetics-Celerity Home » Mass Flow Controllers » Unit-Kinetics-Celerity » Unit-Kinetics-Celerity URS 20 Coastal Instruments services most of Unit-Kinetics-Celerity mass flow controller models. The Unit-Kinetics-Celerity URS 20 included in the list of products we service.