10x36x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack tubing The Bluelab pH Probe has

The Bluelab pH Probe has a double junction reference which provides a longer life than many other pH probes and is a gel filled non-refillable probe

then harmlessly converts to CO2 and oxygen

Graphite Sensor– Reduces polarization effects and does not oxidize resulting in a reliable and accurate reading

Lifetime - >100

depriving the pathogens of their room and board

10x36x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack tubing The Bluelab pH Probe hasNordic Pure Custom MERV 13 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition