20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 4 Pack complete-systems 45*) and 2 custom buffers*

45*) and 2 custom buffers* pH Temperature Compensation Automatic -5 to 100˚ C (23 to 212˚ F) (using integral temperature sensor) ORP Range ±2000 mV ORP Resolution 0

derived from living organisms

The HI50021P is for 25 sachets containing 20 mL of solution that is used to verify the calibration and functionality of the pH electrode

TTT 2600 Nets - Kief Screen

25”W x 41

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 10 Air Filters 4 Pack complete-systems 45*) and 2 custom buffers*Important 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. We also carry 4 7 8 and 5 1 4 inch depth filters,