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Test the PAR of grow lights accurately for any color. The sensor inside is from a famous Japan semiconductor company. Show the PAR of the blue, green, and red in the light seperately. Logger 400 historical PAR data. Record DLI for 28 days. Up to 14000umol/(㎡s). The telescopic rod inside the package can help to test PAR at the top of plant, or PAR above the distant plant. Long time use. 3 AAA can be used for more than 100hours.