The GW34320A-FU from Shenzhen htfuture Co., Ltd is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone <10m, Attenuation Dead Zone < 12m (Decay area), Optical Wavelength 1310 to 1550 nm, Dynamic Range 32 to 34 dB, Pulse Width 5ns, 10ns, 20ns, 40ns, 80ns, 160ns, 320ns, 640ns, 1.28µs, 2.56µs, 5.12µs, 10.24µs, 20.48µs, Auto. More details for GW34320A-FU can be seen below.