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This tester includes features such as a replaceable graphite electrode
• UL-listed
strong vacuum bags will help keep your goods fresh up to five times longer than traditional storage methods
STURDY AND DURABLE – Heavy-duty plastic construction will endure through many growing cycles
pH CALIBRATION
18x27x1 MERV 13 AC Furnace Filters 6 Pack Reflective & Greenhouse Films This tester includes features suchNordic Pure MERV 13 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200
