12x20x 1/2 Half Inch Ring Panel MERV 13 Furnace Air Filters 6 Pack Lamps up to 8x stronger than

up to 8x stronger than General Hydroponics

A replacement probe for Bluelab Combo and pH Meters

• Improves nutrient and water uptake

Measurement Range: 0-9990 µS

Expect higher intensity and more even coverage in a grow tent

12x20x 1/2 Half Inch Ring Panel MERV 13 Furnace Air Filters 6 Pack Lamps up to 8x stronger thanNordic Pure Half Inch Ring Panel AC Furnace Air Filters consist of an internal frame bonded between flat layers of two different types of electrostatically charged HVAC furnace filter media. The first layer is a high capacity, polyester filter material which acts as a pre filter, capturing large airborne particles. The second, more efficient, layer is a MERV rated smooth poly blend filter material. The electrostatic charge works as a magnet to draw in