with a power meter or multi tester for free Features: `42/40dB high dynamic range `Rugged `1.6m short event dead zone `High quality touch screen `0.1m sample resolution with 65534 sampling points `Offer Chinese and English interface `Deep memory for data storage `Transmit data to PC by serial or parallel interfaces `Battery operation life over 8 hours `Intelligent battery capacity display `USB interface `Write/read file in Bellcore GR196 file forma Pulse Width 10ns to 20480ns Ordering No. (P5-3542 P5-3537 P5-3532 P5-5636 P5-8332 ) Central Wavelength (1310/1550+/-20nm 1310/1550+/-20nm 1310/1550+/-20nm 1550/1625+/-20nm 850/1300+/-30nm ) Applicable Fiber Signal-mode Signal-mode Signal-mode Signal-mode Multi-mode Dynamic Range (SNR=1) 42/40dB 37/35dB 32/30dB 36/36dB 24/32dB Event Dead Zone *1 <=1.6m <=1.6m <=2.5m <=1.6m <=3m Distance Range 1.6km~512km Sampling Resolution 0.1m~32m Sampling points 65534 Distance Measurement Accuracy +/-(1m+sample space/2+measurement distance*0.01%) Display 640*480, 7.7"color LCD (touch screen) Interface USB, RS232, Printer, Keyboard Optical Connector FC/UPC (universal connector, option) Power Supply DC:17V~22V:(3A),(AC adapter 100~240V, 50/60Hz,1.5A)built-in Lithium battery:8 hours*2 Dimensions 258*198*90(mm) Weight 2.7kg