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SPC3000 Particle Counters
"3301: Measures 0.3 μm to 25.0 μm
3501: Measures 0.5 μm to 25.0 μm
0.1 CFM (2.83 LPM) flow rate
Connect using Modbus RTU/ASCII over isolated RS-485
Complies with ISO 21501-4 and JIS B9921 standards
Seamless integration into a facility monitoring system"