| Model | MS-321 (Sensor) | |
| Sensitivity (Luminance) | 50 kcd/m2 (full scale) | |
| Resolution | about 15 cd/m2 | |
| Sensitivity (Irradiance) | 300 W/m2·sr (full scale) | |
| Resolution | about 1.0 W/m2·sr | |
| entire sky scanning time | 4 min/145 points | |
| resolution (angle) | 0.0036° | |
| accuracy (angle) | 0.2° | |
| Model | MS-321 (Tracker) | |
| Motor | Stepping motor | |
| Motor driving mode | Half step | |
| Driving technology | Harmonic Drive | |
| Pointing accuracy | < 0.01° (Solar Elevation: 0 to 87°) | |
| Angle resolution | 0.009° | |
| Rotation angle | Elevation-angle(-15° to +95°) Azimuth-angle(0° to +/-180°) | |
| Torque | 12 Nm | |
| Payload | 7kg balanced | |
| Tracking mode | Sun-sensor mode and Calculation mode are automatically switched. | |
| Tracking accuracy of Sun-sensor mode | +/- 0.01° | |
| Sun-sensor field of view | +/- 15° | |
| Environmental Protection | IP65 | |
| Temperature range | From -40 to +50°C | |
| Altitude for solar position calculation | No Limitation | |
| Communication | RS-232C, 9600bps, 8N1 | |
| Power requirement | AC100 to 240V, 50/60Hz, 20W DC18 to 30V, 15W for DC optional Sun Tracker | |
| Dimension | 430(W) x 380(D) x 440(H) mm | |
| Weight | 12.5 kg | |