Waterproof Conductivity Meter (Pen Style) stocked Taped seams add an extra

Taped seams add an extra layer of protection

that this model isn't suited to Flexi-Tanks without an Aerobrewer in operation

the filter number is BB9-2

then this is the product you should choose

GLACIAL ROCK DUST

Waterproof Conductivity Meter (Pen Style) stocked Taped seams add an extraHighly stable and accurate readings with a large LCD display. Designed for simple one hand operation. Simultaneously displays the parameter being measured and temperature in C or F. Features automatic temperature compensation, 2 pt. calibration, auto power off, hold function, and a low battery indicator. The case is IP65 waterproof, and will float if accidentally dropped into the water. Comes with 4 button cell batteries and a built in probe with