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Model 228 Particle Counter

Type: Normal Models: 228A, 228B, 229A, 229B Micron sensitity, sample rate, and particle display amount dependent on model

Model 237 Particle Counter

Type: Portable Models: 237A, 237B, 237H Micron sensitivity and internal/external printer inclusion dependent on model

Model 2408 Particle Counter

Type: Laser-Based Models: 2408A, 2408B Micron sensitivity dependent on model 6 size channels with individual alarms for each size.