16x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 10 Pleated Plus Carbon 1 Pack Sprayers and Wands This gauge is great for

This gauge is great for use with water systems

pH and EC/TDS readings are automatically temperature compensated

Included is an alarm relay

PLUS a healthy dose of Vitamin B1 to help relieve stress caused by high performance bloom regimens

Highly concentrated for rapid adjustment

16x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 10 Pleated Plus Carbon 1 Pack Sprayers and Wands This gauge is great forImportant 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,