This instrument is used to measure photosynthetically active radiation (PAR) within a bandwidth of 400-760nm. Measurement range: 1 × 10^-4～5.932×10^-2mw/cm² （ 0--2742μmols^-1m^-2）
1、 Main technical indicators
1) Relative difference (spectral response):<10% (for crown planting)
2) Accuracy:<± 0.5% of the measured value ± 1 word
3) Accuracy:<± 5% ± 1 word of measured value (relative to NIM standard)
4) Spectral response characteristics: simulating photosynthetic efficiency function
5) Linear error:<± 0.2% of the measured value ± 1 word
6) Temperature characteristics:<± 0.1% of measured value/℃ ± 1 word
7) Stability: Change within one year ＜ ± 2%
8) Response time: 10 μ s
9) Azimuth angle: When the sun's altitude is 45 °, the error within a 360 ° range is less than ± 1%
10) Application temperature: -30 ℃ -55 ℃; Relative humidity 0-100% (without condensation of water vapor)
11) Storage method: 4G TF card storage
IIcharacteristic：
1. Integrated design, LCD screen display, capable of timed or freely set interval time for information collection, storage, and computer communication;
2. High measurement accuracy and fast corresponding speed;
3. Small in size, lightweight, and easy to operate;
4. Low price, suitable for China's national conditions.