Model HD-410 Measu. ITEMS Smoke opacity, Smoke Dencity, RPM(option) Light Source Green LED(565nm) Detection Photodiode Shell Length & Inside.Diam. Length : 215mm , Inside diameter : 21mm Shell Tempur. Maintain constantly about 80 Repeat Within 1% Precision Within ±1% (RPM :±80rpm) Responding time 0.5second(90%) Smoke detecting speed 60 times per a second Display of smoke density 4 times per a second Data dispatch RS232 Method, 4 times per a second (Ref. Protocol) Warming up time About 6 minutes Using filter 0.5second Besel low pass digital filter Electricity source 220V AC / 110V AC 60Hz Expending Wattage About 50W Proper temperature 0~40 Size 400(W) x 170(D) x 200(H) mm (excluding prop) Weight About 5kg Probe length 760mm Probe inside diam. Inside diameter: 10mm Option RPM sensor (battery re-charge method), Temperature sensor Supplied Accessory Probe, Electric code, Manual