"LOW CONCENTRATION PARTICLE COUNTER MAINFRAME WITH SENSOR; USED FOR AUTOMATIC COUNTING AND SIZING OF PARTICLES IN LOW SAMPLE CONCENTRATIONS AT A HIGH SAMPLE FLOW RATE; MAX PARTICLE CONCENTRATION 100,000 PARTICLES PER CUBIC FOOT; SAMPLE FLOW RATE 1.0 CUBIC FOOT PER MINUTE; MAINFRAME SUITABLE FOR 19 INCH RACK OR TABLE TOP MOUNTING; SENSOR MAY BE REMOTELY LOCATED FROM MAINFRAME"