| Modules | OTDR2000 | OTDR4000 |
| Central wave length | 1310nm/1550nm ± 20nm | 1310nm/1550nm ± 20nm |
| Type of compatible applicable fibres | single-mode | single-mode |
| Dynamic range | 15/16dB(40-50km) | 30/32dB(100-110km) |
| Min. event deadzone | 1.6m(single-mode) | |
| Ranging accuracy | ±(1m+sampling interval+0.003%×distance)(excluding refractive index imbedding error) | |
| Resolution of ranging | 0.1m-16m | |
| Loss threshold value | 0.01dB | |
| Linearity | 0.05dB/dB | |
| VFL output power | 5mW | |
| Measurement range | 4, 8, 16, 32, 48, 64, 128, 256km(single-mode) | |
| Pulse width | 10, 30, 80, 160, 320, 640, 1280, 2560, 10240ns | |
| Number of sampling points | 65K | |
| Waveform storage capacity | 1000 frames | |
| Range of refractive index | 1.00000～2.00000 | |
| Range of optical-cable correction factor | 0.80000~1.0000 | |
| LCD display | 640×480, 5.1” color LCD | |
| Port | USB | |
| Optical output port | FC/PC | |
| Power supply | AC/DC adapter: AC input: 100V～240V(1.5A) Output DC: 9V(2A) Power frequency: 50Hz～60Hz Internal lithium battery: 7.4V, 4400mAh Working hours of battery: 10 hours (normal temperature) | |
| Menu language | Simplified Chinese/English | |
| Environmental requirements | Storage temperature: －40℃～70℃(exclusive of battery) Relative humidity: 5%－95%, no condensation | |
| Dimensions | 215mm×130mm×66mm | |
| Weight | About 1kg | |
