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Advanced Quantum PAR Meter - $100 (Tucson)
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The best way to judge the output of your indoor lights.
Maximum light sensing for your indoor grow room.
Measuring in PAR allows you to set lights for the optimal vegetative or flowering growth phases.
These unit go for $150 new on Amazon.
I used mine only for a couple of cycles, only a few times each cycle.
This unit is like new and will serve you well for many years.
Box and original packaging are included.