12x25x 1/2 Half Inch Ring Panel MERV 10 Furnace Air Filters 6 Pack hawthorne Electrodes can become dirty from

Electrodes can become dirty from use and will produce inaccurate results even as they read correctly in a pH buffer

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The SPH-1 comes complete with the SPH-1 hub

12x25x 1/2 Half Inch Ring Panel MERV 10 Furnace Air Filters 6 Pack hawthorne Electrodes can become dirty fromNordic 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