| Model number | ALK-1001A | ALK-1001B | ALK-1001C | ALK-1001D |
| Measurement Range( dBm） | -70~+6 | -50~+26 | -70~+6 with 1000 records | -50~+26 with 1000 records |
| Wavelength (nm) | 800 ~ 1700nm |
| Detector size | InGaAs Ф0.3mm(Ф1.0mm, Ф2.0mm Optional ) |
| Uncertainty | ±5% |
| Calibrated Wavelength(nm) | 850, 1300, 1310, 1490, 1550, 1625 |
| Resolution (dB) | 0.01 |
| Optical Connector | FC( Interchaneable SC, ST)/ 2.5mm universal type |
| Power Supply | Alkaline Battery ( 3 AA 1.5V batteries ) |
| Battery Operating Time | 240 h with 1.5V Battery (3) |
| Operating Temperature (℃） | -10 ~ + 60 |
| Storage Temperature (℃） | -25 ~ + 70 |
| Relative Humidity | -0 to 95% (non-condensing) |
| Dimension (mm) | 200*90*50 |
| Weight (g) | 285 |