| Model | WF28 |
| Display Mode | CIELAB,CIELCH |
| Color Difference Formula | E*ab |
| Illumination Condition | CIE Recommendation:8/d |
| Light Source | LED blue excitation |
| Sensor | Photodiode array |
| Measurement Caliber | φ8mm |
| Measurement Condition | Observer:CIE 10° Standard observer Light source: D65 Contain light way:SCI SCE |
| Measurement Range | L: 0 to 100 |
| Repeated Accuracy | E<0.07(take the deviation average after 30 times measuring the whiteboard) |
| Table Difference | E<0.2 |
| Measurement Interval | 0.5 Sec. |
| Storage Capacity | Type sample data : 100 with testing sample data: 200 |
| Language Patterns | Simplified Chinese/English |
| Battery Charging Time | 8 hrs |
| Battery | Li-ion battery, 5000 times Measurement |
| Lifetime of Bulb | 5 years more than 1.6 million measurements |
| Display Screen | TFT true color 2.8inch@(16:9) Resolution ratio:400x240 |
| Interface of External | RS-232 (115200bps)- connected with micro printer |
| Working Temperature Range | 0℃-40℃(32℉-104℉) |
| Storage Temperature Range | -20℃-50℃(-4℉-122℉) |
| Humidity Range | Relative humidity less than 85%,without condensation |
| Weight | 700g |
| Size | 199*68*90mm |
| Size of Exterior Package | 400*240*340mm |
| Standard Accessories | 3000mAH Li-ion battery/AC adapter/User manual/Warranty card |
| Optional Accessories | Flour measuring device/Liquid measuring device/Micro printer |