17x25x1 Exact MERV 13 Plus Carbon AC Furnace Filters 12 Pack Grow Light Reflectors The meter can be recalibrated

The meter can be recalibrated with digital calibration using the push buttons

Root Zone aeration helps improve overall root structure

May also be used as a bloom booster or as part of the Elements Total Solution

Keep your shelf supply in a dark

17x25x1 Exact MERV 13 Plus Carbon AC Furnace Filters 12 Pack Grow Light Reflectors The meter can be recalibratedNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.