20x25x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack growing-accessories • Daylight readable blue LEDs

• Daylight readable blue LEDs

These industrial combination pH or ORP sensors use the conventional measurement technique

Food- and furniture-grade materials

just place it on top of Big Mama

(best for thicker oils)

20x25x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack growing-accessories • Daylight readable blue LEDsImportant 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