CT-6310RS-20PPM 온라인 잔류염소 측정기, CLE 2.2-4P prominent Sensor CT-6310RS-20PPM 온라인 잔류염소 측정기, CLE 2.2-4P prominent Sensor CT-6310RS-20PPM 온라인 잔류염소 측정기, CLE 2.2-4P prominent Sensor