Máy đo màu ánh sáng EVERFINE LM-3 Luminance meter
Technical specification：
1）Measurement function：Luminance(Y)
2）Lens focal length：f=85mm
3）Viewing field：8°
4）Measurement distance：0.4m~infinity（Close-up lens is optional ）
5）Viewing angle：2°、1°、0.2°、0.1°
6）Minimum measured size（0.4m）：~Φ11mm、~Φ5.6mm~Φ1.1mm~Φ0.55mm
7)Luminance measurement rangecd/m2(under standard A source)：0.001~4000 000（different range at different Viewing angle）
8)Luminance measurement rangecd/m2(under standard A source)：±2.5%±1digit/±3%±1digit