Specifications :
Optical Density Difference at two wavelengths: 650 nm and 940 nm
Measurement Area: 2 mm x 3 mm (Approximately 3/32 in x 1/8 in)
Light Source: 2 LEDs
Receptor: Silicon Photodiode
Power Source: 2 AA alkaline batteries (1.5V)
Repeatability: Within ±0.3 SPAD unit
SPAD Value: Index of relative chlorophyll content; -9.9 to 199.9
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