Pocket-size PAR logger

DEFI2-L - JFE Advantech Co., Ltd.

DEFI2-L is a high-precision photometer for long-term observations (up to 573 days for 1 minute interval observation). The cosine correction allows the sensor to have an excellent spectral sensitivity even when the light source is not directly above the sensor. Also, AAA alkaline batteries used by DEFI2-L are easily available, reducing the operating costs.