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Cooling ridge for better heat dissipation without losing efficiency
amino acids and protein production
The Bluelab Soil pH Meter can be used by everybody from the home enthusiast through to more robust commercial applications
Salinity Accuracy: 2% full-scale 1 LSD
20x25x4 (3 5/8) Pleated MERV 8 Air Filters 2 Pack double-ended Cooling ridge for better heatImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. If you are replacing a 4 3 8 depth 20x25x4 filter