Instrument parameters:
*Using stable, strong light resistant, and impact resistant silicon photovoltaic cell detectors, with strict visual correction, accurate photometric measurement can be achieved
*Wide measurement range, can measure 0.01~19990cd/m2 without using a dimmer
*Digital display with good reproducibility of indication and data latch function
*Low electrode consumption, 9V laminated battery can be used continuously for 100 hours
*Compact and portable, easy to use * Equipped with a stable, strong light resistant, and impact resistant silicon photovoltaic detector, it undergoes strict visual correction to achieve accurate photometric measurement
*Wide measurement range, can measure 0.01~19990cd/m2 without using a dimmer
*Digital display with good reproducibility of indication and data latch function
*Low electrode consumption, 9V laminated battery can be used continuously for 100 hours
*Compact and portable, easy to use

Technical indicators:
1. Measurement range: 0.01~19990cd/m2
2. Accuracy: ≥ ± 0.5% ± 1 word of the measured value
3. Accuracy: ≤ ± 4% ± 1 word of measured value (relative to NIM standard)
4. Spectral response characteristics: comply with national first-class standards
5. Linear error: ≤ ± 0.2% of the measured value ± 1 word
6. Temperature characteristics: ≤ ± 0.1% of the measured value/℃ ± 1 word
7. Long term stability: Annual variation<2%
8. Operating environment: temperature 20 ± 20 ℃, humidity<85%
9. Size and weight: 180 × 80 × 36 (mm) 0.2 kg
10. Power supply: 9V laminated battery

Structure:
The instrument consists of a metering probe and a reading unit, which are connected by cables using plugs and sockets. The functions of the buttons on the left side of the reading unit are as follows:
Power ": Press this button to turn on the power, lift this button to turn off the power
'Hold': Pressing this key indicates the data holding state, while lifting this key indicates the data sampling state. When measuring, lift this button
Brightness ": When measuring brightness, press this button (also note to lift the" Expand "button).
Expansion key ": Select accessories according to user requirements for functional expansion. Press this button when performing extended function measurements (also note to lift the 'Brightness' button).
The four range buttons are "X1", "X10", "X100", and "X1000"